Malicious PDF — malware analysis report

Static analysis result for SHA-256 9503bee53997dfaf…

MALICIOUS

PDF

79.5 KB Created: 2021-03-06 14:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4dd1284b875526c7576846c8375aaf11 SHA-1: d32e91ce0dcdbd8349157635f485349c264e3a9c SHA-256: 9503bee53997dfaf55f3f5f0b479bc517af48a969defd143a8d16238dc82e404
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=niv+study+bible+fully+revised+edition+personal+size PDF link annotation
    • https://cdn.sqhk.co/bevurokakug/Vhahjjc/76617979368.pdfIn PDF document text
    • https://silagonamep.weebly.com/uploads/1/3/1/4/131452845/33124f7e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_6034eb30bf03d.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/eRTuijb/special_operations_forces_interagency_counterterrorism_reference_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedevatas/icijkih/fill_the_glass_to_the_brim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485309/normal_6001d940bd887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420775/normal_5fc8a2947940c.pdfIn PDF document text
    • https://viriparerari.weebly.com/uploads/1/3/5/9/135978168/zubikonun_rozofumowega_metugaz_busurubeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403684/normal_601585c4a284f.pdfIn PDF document text
    • http://medyahanem.com/mededegeqk5u3.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/RdihXji/brawl_stars_star_park_theme.pdfIn PDF document text
    • http://bellissimo.online/68559227474ysbc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449616/normal_6003690554404.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/zemunomipazikez/74480215035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ca2e37-7593-4a4a-a77d-c3c7c899f41a/blue_bossa_joe_henderson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8babd34-1197-41f7-8037-028e62a58b29/idle_hands_make_the_devils_workshop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18134fa3-dce8-4f41-9b81-615035a04b58/vifubizulijefavubige.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/pan_card_duplicate_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c026d93-6a8c-4567-9969-371962462fce/67673170948.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_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 5356 bytes
SHA-256: e29f3c2c421b5f17b6610ee1046a1969ab7be7aae52222a4cba507f37ed015c0
font_01_sfnt_off00010dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 10108 bytes
SHA-256: 574fd27e8d15b0691ddeb6a9895f396df80979d42c6d66985b94e71e8ecb5a66

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