Malicious PDF — malware analysis report

Static analysis result for SHA-256 4939bf1234096043…

MALICIOUS

PDF

69.1 KB Created: 2020-11-25 15:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e837f537274a06d20cdbb02d01f9472b SHA-1: b857caa5b6ac5bc39b361c47b61045392f87e0b9 SHA-256: 4939bf123409604339b8a42c022e2d9109cf5c50a050fa0efeee776dfef947aa
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with one pointing to 'trafffi.ru', suggesting a phishing or SEO spam campaign. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, many hosted on S3 buckets, which is a common tactic for distributing malicious content or for SEO manipulation. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely related to distributing further malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/123?utm_term=german+coast+uprising+summary PDF link annotation
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/kukagonuwusanukul.pdfIn PDF document text
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/5928830.pdfIn PDF document text
    • https://bupigesow.weebly.com/uploads/1/3/4/3/134360728/8545510.pdfIn PDF document text
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/01971e0e05e0b9f.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/gixawetopoli/zafubise.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/dudivenelinadapax.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/affine_and_projective_geometry_bennett.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/16817205936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8aee8d-3106-495a-85db-73ed94433aac/xomefubabujuvozidejali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5dbc294-cb77-4dc8-b4fb-47f0cb0161a1/2978202725.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_off0000d26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26D 5356 bytes
SHA-256: 62e85231e87dd8fbe2805618b04389176016e4d7a24c715da06031c4677fa1d2
font_01_sfnt_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 10396 bytes
SHA-256: 031d902d8b51c63c1358fab1a44d47b5ac3bd84428d957662131e2d98b6217c4

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