Malicious PDF — malware analysis report

Static analysis result for SHA-256 598a76dcaec917ff…

MALICIOUS

PDF

77.9 KB Created: 2021-02-17 04:32:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e860d9d8dfc898457a879d22e51e497d SHA-1: 36451e5383003c0756e597b678218d41e94f1bd2 SHA-256: 598a76dcaec917ff8601b757be9e07954a559f1194334b43c2637d331b06ead2
134 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 and presents a deceptive download button. 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 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://crophysi.ru/wix?keyword=tekken+3+apk+obb+download PDF link annotation
    • http://kolejuf.iblogger.org/doctor_letterhead_template_free.pdfIn PDF document text
    • http://datingdate.site/buxugozarotasebamoga32w1m.pdfIn PDF document text
    • http://betmoy57.com/the_norton_introduction_to_literature_portable_12th_edition_freeqlvex.pdfIn PDF document text
    • http://obuv-kozha.ru/kudodadefrt6cw.pdfIn PDF document text
    • http://item-mask.top/86479584037ql4uz.pdfIn PDF document text
    • http://confirmationhelpcenter.com/babejozeworilepa0211.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/8372610.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/447994c43f.pdfIn PDF document text
    • https://kuxijixa.weebly.com/uploads/1/3/4/8/134856984/vadavis.pdfIn PDF document text
    • https://zekubetude.weebly.com/uploads/1/3/0/7/130738740/2adbeff7.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/36381821985tmn7r.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/jEqdQX5/chiiki_unlimited_time.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/Njficje/infinite_loop_answers_level_1110.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/sugowubuf/88196190119.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/24073122774.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/alage_alage_song_in_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/3573459347.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_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 5088 bytes
SHA-256: a50093776ac584a43eddaa3acbf5d67732c0924b0bc8144014fc958d439b271b
font_01_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 10412 bytes
SHA-256: ca22088a2232554cf21d1e185b66bc0881e2eaa4ca551e603dc334c459037c19

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