Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2efaf5f7fb49a6…

MALICIOUS

PDF

78.1 KB Created: 2021-02-10 17:56:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7277c9f0b0bcf9059767c751a6bef679 SHA-1: dae38d9f966bbf26f683d3e363a1673c215b63e1 SHA-256: af2efaf5f7fb49a6cdf4c9c90b0dd14a5908790e31263e5e57d5e1159024332e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that point to other PDF files. The presence of a large number of external links, some hosted on disposable domains, suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, and the document body was heavily obfuscated.

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/aws?utm_term=practical+guide+to+clinical+examination PDF link annotation
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/6589f833869f83.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/icAicje/rumijoninobexukezot.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/hgggfih/24725875581.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/ghh4Cgd/alto_s_adventure_land_a_triple_backflip.pdfIn PDF document text
    • https://zeduxuvanoripi.weebly.com/uploads/1/3/0/7/130775880/299803.pdfIn PDF document text
    • http://ductsunlimitedins.com/free_light_presets_downloadgv20r.pdfIn PDF document text
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/2b4373ba9372.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/jgficjj/wenefe.pdfIn PDF document text
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/vinevet.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/icsibCT/australian_cruise_careers.pdfIn PDF document text
    • http://3gusevshop.website/6251986112232pyl.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/yehhHgh/zafanures.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/mjfy8jj/planets_number_in_astrology.pdfIn PDF document text
    • http://boost-shop.xyz/zopiv6l75n.pdfIn PDF document text
    • http://lifeit.pro/libro_de_cimentacioneslh5xw.pdfIn PDF document text
    • http://swiss-gear.store/75263835171mps2m.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/hdjjjdR/tutifurikilidoxogeturowuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumojito.rf.gd/vuvutagilinogevagilo.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_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 5152 bytes
SHA-256: d803078de9df7c5b0d2c922958a15b211904a2b92feaefec8e8ea1d4452ce5fe
font_01_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 10360 bytes
SHA-256: 32250b5abf4451662a21cf498d7c3d8114002a46c04bc4b0edd11c1a5bbf0811

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