Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea427c8ad2bac6fc…

MALICIOUS

PDF

73.0 KB Created: 2020-11-14 00:32:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1f8bcc5730efc6ddc2593821e158e87b SHA-1: 1c290810a33e5aa22198857d0e66d6570cd06590 SHA-256: ea427c8ad2bac6fc039659e53a370b5e2143a417d7e6bd890d5579d6cfa3bc32
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or SEO spamming technique. The presence of a critical heuristic for PDF SEO link farm and ClamAV detection of 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The embedded URL 'https://trafffe.ru/123?utm_term=midea+mini+fridge' is a primary indicator of the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffe.ru/123?utm_term=midea+mini+fridge PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415951/normal_5fa686bb2f15f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451028/normal_5fa175c87685e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5f88c1b34a8fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5f88ac3a92347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_5f9d1b6b7d730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_5f9378aab2b76.pdfIn PDF document text
    • https://tijabitosivu.weebly.com/uploads/1/3/4/3/134396728/lisoxusa_wunusepanunus_pezevufofem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5fa0247436869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470220/normal_5fae0c29b52e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_5f9b92925f6ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420902/normal_5fa794357d34a.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/a60b34a8-0633-4d47-aa5d-f2d49a99ab1f/vukimiduvafal.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/harlequin_presents_free_downloads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3015695b-98f7-4213-aaa4-3585c0235721/81359587713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d216978a-b375-45b6-a6c7-85c352d5320d/62984968909.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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 5024 bytes
SHA-256: d60d77dfabd2e84183bd11c7ea4a775e58acbaa16ed0d7c0a3b1fed498656074
font_01_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 11212 bytes
SHA-256: 3a020dea4c219d458e73007a565a12336b31c84c8ac5106653d03dac9e107bb4

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