Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34359aa21f1a384…

MALICIOUS

PDF

62.3 KB Created: 2020-12-28 12:16:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6ab7a19c7b0ecb68fb73eebe3725aee1 SHA-1: d6b0f9339053e951cb5d6fd33bb190d560364b3f SHA-256: a34359aa21f1a3847ef7a1ec29372a35ebceed70d5d49f352898fe473c972da4
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The presence of a link farm and a lure suggesting a payment is a strong indicator of a phishing or credential harvesting attempt. The embedded URL, https://traffset.ru/strik?utm_term=movistar+colombia+pago+celular, is likely the primary destination for this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffset.ru/strik?utm_term=movistar+colombia+pago+celular PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5f8aa446d9c11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_5fb6f01c1f3eb.pdfIn PDF document text
    • https://cdn.sqhk.co/lojeliju/f7hfijl/43315658730.pdfIn PDF document text
    • https://zabagazepag.weebly.com/uploads/1/3/4/4/134498959/66f73467b768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_5fd7f47c808f0.pdfIn PDF document text
    • https://difegalit.weebly.com/uploads/1/3/2/6/132681294/6ab7c96d0eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408721/normal_5fc4801a2e26e.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/fK9jhE2/archery_club_pvp_multiplayer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_5fa7f5eb59ac4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/41568eb4-a5c0-4424-bcc5-c3f8f47934a9/62280706432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e26c4d-36cd-4d06-a733-5f2d207f6f31/15636606554.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/nazukat.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_off0000b69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69D 5460 bytes
SHA-256: 7ddd50f196bfa9b7427fa9a3febc5d021060b0207af09b30b542d7559cbe9203
font_01_sfnt_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 10388 bytes
SHA-256: 60c4bda8d9f51f60d900c30210f812a3325b879e988da66fbec423584b3ab8e1

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