Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9b018d6cae6142…

MALICIOUS

PDF

111.5 KB Created: 2021-03-10 09:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: eb2e25a89f47852666a9a9c5e5191d50 SHA-1: df580bf8c1e3e31aeb400e88b664648267791e74 SHA-256: 8c9b018d6cae61420290e12ffc28769dfdbb235dc74cb7933ff79dd6bdc2f83f
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to a suspicious domain ('mezovuduw.ru') that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a ringtone, suggesting a social engineering pretext to encourage interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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 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://mezovuduw.ru/123?utm_term=jai+bhola+bhandari+ringtone PDF link annotation
    • https://cdn.sqhk.co/jepogedofuz/jfvjaic/wesigulowikodugafogobe.pdfIn PDF document text
    • https://cdn.sqhk.co/wenudiwome/fhc3ssn/gesevasofesulo.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/94776853437.pdfIn PDF document text
    • https://cdn.sqhk.co/bipujawojeli/bKwic27/mireng_free_kpop_song_lyrics.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/57295888032.pdfIn PDF document text
    • https://cdn.sqhk.co/dikulodut/Fb2gj4p/54096029337.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/bgEaGN7/bloomsburg_university_bookstore_hours.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/mr._coffee_12_cup_coffee_maker_with_easy_on_off_led_switch_white.pdfIn PDF document text
    • http://hookup671.site/teduxunokutazamjppr.pdfIn PDF document text
    • http://fixmarker.fun/51947545408lnf9b.pdfIn PDF document text
    • http://newyearshop.site/tugevusojumisixupanc6q7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/101dca31-369a-4115-af64-121bd296521a/how_to_view_list_of_files_in_command_prompt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e20931-8400-4222-81d5-c2e968c0c61e/mirorinavoxotomabobitevi.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/file_from_github_using_ansible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb31bfa-aecd-4a13-bf1d-fbbf518424e3/91775193259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81fe8ee-4a9b-4595-85fe-4f43b6b86dab/brady_infinity_gauntlet_meme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e647bb83-1f00-4660-9dc9-0d0e9ffec3bd/spt_wa-1420e_portable_air_conditioner_14000_btu_manual.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/stihl_fs55rc_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f544d72c-aea8-436b-8d9e-adbf37e37cac/96314709235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb633fd-fdb9-47b6-890a-5a2e4c7d51d0/sijomek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8e7f71-1c66-4d2c-b224-7b8256408eaa/how_to_clean_whirlpool_dishwasher_not_draining.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/pentair_fns_plus_48_backwash_valve.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016b95.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16B95 27836 bytes
SHA-256: ae673eab88fcdd579ebc775bd1559a0bc28a6f7480e41bfc106491aa5224ea24
font_00_sfnt_off00012841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12841 3104 bytes
SHA-256: 24551eddf735aab63d4c7e1e241f9f40a571c0286a9358847cb31cf4386de53e
font_01_sfnt_off00013354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13354 5036 bytes
SHA-256: a0c7fb058bf57141b20f7d7cbb056f7f3304b1f9c90d5ee19ab59fecdbbda968
font_02_sfnt_off00014467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14467 11540 bytes
SHA-256: f43786f6dbec166232b8933f327b0ba5b4d11307f6b73e49325a72d828c701a8
font_04_sfnt_off00019d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D27 4448 bytes
SHA-256: 1073680bd876a5a63daec380471e4c853b29748436cbc58f467a74ed71431cc3

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