Malicious PDF — malware analysis report

Static analysis result for SHA-256 050f96dfe2711d8a…

MALICIOUS

PDF

75.3 KB Created: 2021-03-12 14:28:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 869616ee5830fa42416685a0065162ef SHA-1: 225467352832749662431620cd631b470a6fcea4 SHA-256: 050f96dfe2711d8aff679c243c8b9a52167ac4927279d0e8bc5963ad76f24d72
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=modal+verbs+explanation+chart+pdf
    • http://waniwidolo.66ghz.com/89890776102.pdf
    • http://konanozopesan.22web.org/63618325958.pdf
    • http://mosdendy.store/windows_10_power_plan_missing_settingsncgzs.pdf
    • http://tcerkovniekupola.space/acrobat_pro_freeajqxg.pdf
    • http://nopawumakonip.22web.org/wide_aperture_camera_apk.pdf
    • http://svoytrylend.xyz/pevalovebab7uxt2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_294700be55aa449784506abab67ad676.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4fc5b4d7-ecd3-4833-b6f0-882b616b9885/what_diet_is_good_for_clear_skin.pdf
    • https://s3.amazonaws.com/donukadizolin/11063342646.pdf
    • https://uploads.strikinglycdn.com/files/75fcbda5-12ae-4f35-aeb7-a6e9b8d9c440/what_determines_gender_of_human_baby.pdf
    • https://uploads.strikinglycdn.com/files/fdc4517b-bf81-428b-8208-553169e633e9/how_do_you_fix_a_septic_drain_field.pdf
    • https://s3.amazonaws.com/tadevewuju/leseroxuraremesasereva.pdf
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_440f3fc981854cb7aa98db341d494fb4.pdf?index=true
    • http://susosutudufat.rf.gd/how_to_program_genie_universal_keypad.pdf
    • https://uploads.strikinglycdn.com/files/6486c230-49d9-4550-9a5f-57c0e7e625bf/how_to_change_an_air_filter_in_a_lennox_furnace.pdf
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_fa76079d6c6b4aff8e5b670702345962.pdf?index=true
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_c135b6dfdf874a02b0a6c44bd4b9cea3.pdf?index=true
    • https://s3.amazonaws.com/polexebuj/wonderart_yarn_color_chart.pdf
    • https://uploads.strikinglycdn.com/files/f6b6cc63-07d0-45c1-9936-45bffa00a659/do_ego_lawn_mowers_go_on_sale.pdf
    • http://gurepabe.epizy.com/alabaster_girl.pdf
    • http://sadesepipo.rf.gd/joginugumifaz.pdf
    • https://s3.amazonaws.com/lemerisinivum/56966755261.pdf
    • http://lunagugodojeb.epizy.com/jurassic_park_theme_song_trumpet_sheet_music.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ab.bin
1dd077fa2c4d26798becd67aa58c4f39c5737286920b448b3a05c6abb0f400a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 5516 bytes
font_01_sfnt_off0000fb7a.bin
61aefaec86a1f875719ddc7e53649cfc3ed578c786a20730bf7dfc592235f495		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 10612 bytes

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