Malicious PDF — malware analysis report

Static analysis result for SHA-256 11991e94a932b9fc…

MALICIOUS

PDF

141.1 KB Created: 2020-11-19 01:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fbec92df4fa3aa756ba5cf20e858239f SHA-1: ecb3a405e4732582aa2e61e743611f662384098d SHA-256: 11991e94a932b9fc59d44a4cffd442d4c4791c3f54ebcd0869b9efe04b7bef0f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'trafffe.ru', which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through the linked PDFs. No scripts were extracted, but the structure suggests an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=dnd+5e+hand+axe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379841/normal_5f97d3a97d84a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_5fb2a0a5e950e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f8880cf741dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_5fafa3efb9e7b.pdfIn PDF document text
    • https://fusesekomufe.weebly.com/uploads/1/3/1/6/131606177/41276293.pdfIn PDF document text
    • https://xelenupexom.weebly.com/uploads/1/3/4/4/134480667/2159922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409799/normal_5fb30e0df421d.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/cb4556b7-a23a-477c-b5bd-084726f6bcd5/vulotorafewigopusit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320dc740-b36d-4390-b8ce-f4f8c9986c1b/60293336934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b9e3ea-09ba-4bbc-9130-4786a6f13200/gawatilibeganinanulujur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2136a23-ffe9-4cfb-8b04-8ff723a69e95/93851529630.pdfIn PDF document text
    • https://s3.amazonaws.com/lipekipuvenuji/jiwegaxusuxuwitapufuraz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9798b5-5564-4f4a-809d-165adbfee422/ralph_kimball_and_bill_inmon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f96d81fa-2ba1-494c-a0d3-8cd634cde849/ps1_bios_scph1001.bin_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/tell_me_the_secrets_max_lucado.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_off0001ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF5C 4796 bytes
SHA-256: 60c830555ebf7aa885625899a7a94fd3bc0ff61d49c45daec6415f94c81d1b76
font_01_sfnt_off0001ffb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFB8 11516 bytes
SHA-256: e2361249a452f40c5c0fad736dfa69b6947c49e582446dcab8261f045b3151e2

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