Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a50f0bc1bfa9bfe…

MALICIOUS

PDF

78.5 KB Created: 2021-03-26 07:50:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 33363861b34b87827a2db6723239b8b8 SHA-1: 8fea4e6c184c092f3fb89574459790a955de3d04 SHA-256: 9a50f0bc1bfa9bfe1634c5845ca139b55be1a618d79fe974f7fa4a7c1318204a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links to other PDFs hosted on disposable domains. The primary URL, 'https://seumenha.ru/123?utm_term=artificial+intelligence+for+automotive+applications+pdf', suggests a lure related to artificial intelligence, likely to trick users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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=artificial+intelligence+for+automotive+applications+pdf PDF link annotation
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/7724278.pdfIn PDF document text
    • https://gugeropufil.weebly.com/uploads/1/3/0/8/130874104/1081117.pdfIn PDF document text
    • https://cdn.sqhk.co/sowotewope/gneYKFL/49087056734.pdfIn PDF document text
    • https://sodomolu.weebly.com/uploads/1/3/5/3/135398587/cd5424f62dd.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/ihgdPgi/cyclebar_midtown_charlotte.pdfIn PDF document text
    • https://xezatitewifesel.weebly.com/uploads/1/3/4/3/134393938/zegukasujeni.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/berinajekokujoku.pdfIn PDF document text
    • https://zatitobeme.weebly.com/uploads/1/3/4/0/134097178/9696856.pdfIn PDF document text
    • http://sotarebesowula.medianewsonline.com/occupational_health_and_safety_act_poster.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/hhMhgjj/tapupinisosijimixomatax.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/sggqf4u/marvel_comics_store_nyc.pdfIn PDF document text
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/5054501.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/60250095541.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_f48810d89df943c6970df6fbeb116c4e.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_c73e74ac13e24e0b8bba8bdf86e27375.pdf?index=trueIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_bc5f4a54b69b43df82dc96adf0cf5165.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_ef8deccae1254b03b530d9ba8959b4cc.pdf?index=trueIn 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_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 5524 bytes
SHA-256: 3c5d7feb99d7a2fa87fa98c886e046f2f933f43a2da32c0ad044efd1f63b2bec
font_01_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 11136 bytes
SHA-256: 068c9ffaaa60d2b865e38e07b8ed7b3bee766ca2238eaafa149572bb913abdfa

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