Malicious PDF — malware analysis report

Static analysis result for SHA-256 d571a7f02defbfa4…

MALICIOUS

PDF

89.6 KB Created: 2021-01-24 22:38:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a98466ad986f68862060201b311c1b37 SHA-1: 675e6471b44bbe144d6f6b0e43e4b58c631c5212 SHA-256: d571a7f02defbfa4ce2fe32dc2320f2873d93949b61711cf289bd626ab3f3d02
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to multiple distinct hosts, with one identified as disposable. The embedded URL points to a suspicious domain, likely serving as a lure or a distribution point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/wb?keyword=america%20east%20women PDF link annotation
    • https://juxusuvib.weebly.com/uploads/1/3/0/7/130739690/xuxipinuwopusa_zukodazux.pdfIn PDF document text
    • http://everydays.space/carmageddon_64_romgsf5w.pdfIn PDF document text
    • http://tronreserve.online/lego_marvel_super_heroes_3_release_datechsga.pdfIn PDF document text
    • https://sagagokibifaku.weebly.com/uploads/1/3/4/6/134625973/8239687.pdfIn PDF document text
    • http://dontbeshy.xyz/lone_survivor_netflix_2019akc5x.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/joola_ping_pong_table_touch_up_painthmi9c.pdfIn PDF document text
    • http://moymagazin.xyz/kibawikifetovimedozubowa56hd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_5fe8a843338d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/82702594852.pdfIn PDF document text
    • http://xebowuruno.epizy.com/69312756229.pdfIn PDF document text
    • http://nonosolagosev.epizy.com/nujasiresofizive.pdfIn PDF document text
    • http://xubibufopude.epizy.com/81469224653.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/nikepuzo.pdfIn PDF document text
    • http://dudolisimak.epizy.com/zumisirutirixifupabo.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_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 5748 bytes
SHA-256: 26ee033fe23d22d0c97815d4600b9e05a05ca27ddf23c85dd5334220af9f956a
font_01_sfnt_off0001333b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333B 10880 bytes
SHA-256: 7f3472e47d862d8ab2ac92a190a86c74db92c4589dd38313e502a63257bc0368

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