Malicious PDF — malware analysis report

Static analysis result for SHA-256 57617f8a3efb23e4…

MALICIOUS

PDF

68.0 KB Created: 2020-11-11 15:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a76fb8c3443c4af538c3b388c93f371f SHA-1: 82cf38fa455876b65f183cab7f2aa63cb33cf3dd SHA-256: 57617f8a3efb23e4e99f5b0a7c3641add20b480bba0e4a8119e29b5bc7ead963
164 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically mentioning invoice or payment language. It also contains numerous external links, with one prominent link pointing to 'trafffi.ru'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to a malicious site for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://trafffi.ru/123?utm_term=va+form+26-8937+how+to+complete PDF link annotation
    • https://biwulijek.weebly.com/uploads/1/3/4/5/134500127/d99ffe0fe9a4e.pdfIn PDF document text
    • https://sipasegeremiraf.weebly.com/uploads/1/3/4/4/134404187/wilomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f9b1b3b2c143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_5f8e3e055bb37.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/2585027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f902c5e1ddaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f96693e161b2.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/0c377376-25d3-44bd-ac01-d026b62f0af3/43999470367.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/77898061916.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/30523995266.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/xumozidajadamezijenu.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_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 6048 bytes
SHA-256: 16dd36d44670e3ea6906b28dd7300cd6691b36c9d73b54c0b45ee67b8fa7c505
font_01_sfnt_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 10268 bytes
SHA-256: 1eb8ffb12107b16e96d50e187ac66b6ee078c3e5c58f1905f61fe5096abe0629

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