Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e1c857003985a7…

MALICIOUS

PDF

72.5 KB Created: 2020-12-28 12:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3837669ce585ec44f5d52ce130dbd9df SHA-1: efe07569f4e364344b8f7236ba33ad231ba95773 SHA-256: 96e1c857003985a74a8324499100df9756c94e225762ca5214123a6da685f244
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=psychological+skills+training+programme+btec+sport PDF link annotation
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/a0b4ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5fc5707080f2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_5fbe1e096e6c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479674/normal_5fb93b1c0d459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491436/normal_5fd2e8c0658d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378836/normal_5fe06dd90d136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3c910e11-db4a-4100-95c2-3f950169cd46/1768886481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95cfb212-73f8-4343-84c2-5d8c36bc613c/xizer.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/31754801613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e730a8-5961-46a4-98d4-a5c44aa090ad/gattaca_viewing_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19126cf-5123-464a-83f9-2722f44f3f68/kazumasumixilu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD121 5444 bytes
SHA-256: 74837e97fb527e1c55c410343ddb062911cc5814adfd258670f455a4b522ca91
font_01_sfnt_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 10340 bytes
SHA-256: 0e882080b9c6f3a6e8dbb6042526f78b541bb65383b3469dd5ea747d87ff67e4
font_02_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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