Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17b926f2b575dbb…

MALICIOUS

PDF

79.5 KB Created: 2021-02-20 19:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0332fd9264d46e8f706430a97fa88abf SHA-1: 131f85631832d67964c46f355a1d6dcc2939845b SHA-256: b17b926f2b575dbb0524e7add2694de92573d19061ffd1e8cf0e1e1af9ee80cb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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.
  • 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://seumenha.ru/123?utm_term=how+to+write+redeem+code+in+free+fire PDF link annotation
    • http://study-english-02.space/4886593070z83ug.pdfIn PDF document text
    • https://somokowu.weebly.com/uploads/1/3/1/3/131383604/jejirijumopixu-ripirorudimog.pdfIn PDF document text
    • http://biolinkus.me/stick_war_legacy_2_videost71uq.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/bE6sgf0/line_connecting_two_points_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/verikiweneza/iiKEgji/charli_d_amelio_wallpaper_aesthetic.pdfIn PDF document text
    • http://selectgetc.top/car_games_freak_net7r3u9.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/2563363.pdfIn PDF document text
    • https://jofufibiwew.weebly.com/uploads/1/3/5/3/135347649/mozat.pdfIn PDF document text
    • https://nepexinis.weebly.com/uploads/1/3/1/4/131438592/sekagefizoju.pdfIn PDF document text
    • http://reduslimitalia.site/monday_takeout_specials_near_meeoe52.pdfIn PDF document text
    • https://tunorikiwevog.weebly.com/uploads/1/3/4/0/134097136/3167074.pdfIn PDF document text
    • http://voiprormul.xyz/deep_purple_child_in_time_sheet_music0mip9.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/Bhihdic/cartoon_cat_horror_sound_jumpscare_meme_soundboard.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/5fhhieB/7503585077.pdfIn PDF document text
    • https://penebiji.weebly.com/uploads/1/3/5/3/135346042/sipeto-tagibuw-ritotaxowu.pdfIn PDF document text
    • https://lujiwosibe.weebly.com/uploads/1/3/4/0/134040634/runotujare_jopupo_xagezunuwareka_tafup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gojexigubobe.epizy.com/56962738662.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 4800 bytes
SHA-256: c14979046cb271ec48f51992f72755d60bcf8eb711ec334b51d2c4ddcc912c90
font_01_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 10408 bytes
SHA-256: e1cbff3181d9b54d9fc378da2e1777b743d29b01c276d0f00d7b5eb0354d8d1c

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