Malicious PDF — malware analysis report

Static analysis result for SHA-256 2757d9971092ac03…

MALICIOUS

PDF

70.0 KB Created: 2021-02-28 19:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 5aee34390e9859b1119e39000da0051d SHA-1: f5b299e1674421355d0b7c1b0634b0c95cae617a SHA-256: 2757d9971092ac03007ef1a917f4c9819c69af4b2c3ba9605ea9bb5e593adb6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified as a link farm by heuristic analysis. The primary external URI points to 'https://maypoin.ru/strik?utm_term=starbucks+barista+salary+per+hour', suggesting a potential phishing or SEO manipulation lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content via the embedded URLs.

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 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.
  • 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://maypoin.ru/strik?utm_term=starbucks+barista+salary+per+hour PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415070/normal_602d470a590e0.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/uiijjib/rabojerediri.pdfIn PDF document text
    • https://jadotonevuwupu.weebly.com/uploads/1/3/1/4/131407011/1e43d90498d8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_5fd67741438cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413735/normal_5fcf5887d8aab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491965/normal_5feff20723a40.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/f0cjewS/cafe_racer_parts_bmw_k100.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/dn7haB2/paypal_vs_venmo_vs_zelle_fees.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/gd7jbjg/balenciaga_crossbody_bag_ebay.pdfIn PDF document text
    • http://lavka-karamel.ru/99957895344g434w.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/13R16ge/binujodavuzos.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/turip/fubew.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/telefonos_androides_usados_mercado_libre.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/fitabejuka.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/vubameji.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_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 5432 bytes
SHA-256: 9ab9dd16c84974a3d8a30f452a921ddcb5661af693f1700d5004e0fba6d854d4
font_01_sfnt_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 11508 bytes
SHA-256: cf48300b52d08a595e27b908c8551fcd969d087bb8d24af09cc23480b7f167fe

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