Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8957356f13b1c0…

MALICIOUS

PDF

79.2 KB Created: 2021-02-22 20:06:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 89942566c8293252b8d3b0a68afdf616 SHA-1: 8ea3919e81385ce0925cba94b49cb0057c394daa SHA-256: eb8957356f13b1c03379926f6b38cc315957c8ac829f3db5b4a0740cbca586eb
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://seumenha.ru/123?utm_term=merit+badge+pamphlets+online PDF link annotation
    • http://kamaz-ftc.com/xuveputethnzvm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_60328fb94ffff.pdfIn PDF document text
    • http://table-wait.com/marat_sade_script3btu5.pdfIn PDF document text
    • http://cabinetshub.xyz/9050651361675zhv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fd97574bc547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476453/normal_5fec21379a4fe.pdfIn PDF document text
    • http://reetodo.online/wdamage_car_crash_engine_downloada9k41.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/jhhjjaf/mevenuxinub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_60243e774b0cd.pdfIn PDF document text
    • http://momsmall.space/pipububavexunamakaq0si.pdfIn PDF document text
    • http://ourfanz.com/30790647853z50d8.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/jjhj7jf/kepod.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/5319620109976ofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496216/normal_602f87790b714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374369/normal_60028e1f94950.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/tgdkBjb/biximonukozavipo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 5520 bytes
SHA-256: c2dcb6fc1495fe43bfb657fbdd6361ee40f7a6408000d2dd7bd68054d598cf1a
font_01_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 11772 bytes
SHA-256: a2aa648f962ae51cb757d73f6ddd52b7737891efc8670b6f680cd8aa8f3d9a49

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