Malicious PDF — malware analysis report

Static analysis result for SHA-256 db25ab92367a5b4f…

MALICIOUS

PDF

80.1 KB Created: 2021-04-24 20:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cc1e567512f534109ac9c44e038a7429 SHA-1: 255cf2026cb9ee2453db9a2aadc4108ff8d7c640 SHA-256: db25ab92367a5b4f3b8df732edf67b24fcff373417c054b358a30c135460846d
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and an ML classifier. It contains numerous external links, including one to a suspicious domain ('securityofusersdevicesonline.site') disguised as a download lure. The document's structure and the presence of multiple SEO-optimized links suggest an attempt to distribute malicious content under the guise of providing free books.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/strik?utm_term=basic+mechanical+engineering+book+by+rk+rajput+pdf+free+download PDF link annotation
    • http://1xbet-registr.site/the_complete_vegetarian_cookbook_americas_test_kitchenlxs1n.pdfIn PDF document text
    • http://rodsfish.club/ghost_rider_wallpaper_hdbfr9l.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/half_blood_prince_first_edition_valuefxcce.pdfIn PDF document text
    • http://christmas-gift.ru/is_there_a_sequel_to_blood_on_the_riveryb92b.pdfIn PDF document text
    • http://tersq.space/how_to_change_ge_mwf_refrigerator_water_filter0xska.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e7da5ff9-c4b7-4797-854a-c03a2923bc6f/how_to_program_overhead_door_remote_opener.pdfIn PDF document text
    • http://vipipepavi.rf.gd/forming_adjectives_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7308b0-c69a-41ab-8547-ddef577fd614/weber_7105_grill_cover_for_spirit_210_series_gas_grills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f1abc8-7aee-4cb0-8512-7d1a818c870a/commutative_property_of_addition_worksheets_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/plague_inc_evolved_bio_weapon_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/dasesolavonilafud.pdfIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_4ef984ce958940ddbd4eb9a3bae24820.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec84c0b-8282-442d-97d5-9bb1937270d7/how_to_use_sodastream_sparkling_water_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/christmas_carols_book.pdfIn PDF document text
    • http://wesovipimamino.epizy.com/51517943463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9986c9-983c-432f-940e-816ee8c75bfa/the_art_of_seduction_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5135c1c-d2f9-49ae-aebc-e90439de0001/vugidagojakojaxaxidugin.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_65af21a2016a49289941c0e2df2c9307.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75edc1db-f4d4-414e-bc34-027c20de7259/how_to_become_a_certified_forklift_operator.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/fannie_mae_and_freddie_mac_lending_guidelines.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_190570d42a674db19d61dc543e130db0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55345a93-4ae0-43a3-83f3-d85c846b5968/siwazumufi.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_3d7ee5dfc6454119a135c66a0ddcbfe8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/bmtc_bus_pass_form_for_engineering_students.pdfIn PDF document text
    • http://fewetero.epizy.com/29604531113.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 5972 bytes
SHA-256: 844f1643eb7f9695185a2cd39d59d215f7e78a34335b9fa0de893e848015d9fd
font_01_sfnt_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 11148 bytes
SHA-256: 25cdaaeee2ecf1bbf80f051c75c519df0342c9618104bdac354624e9058574eb
font_02_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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