Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f83e3d0a38a7a92…

MALICIOUS

PDF

96.2 KB Created: 2020-12-19 14:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e991b2c42cd57d10714a6ed733337dee SHA-1: d463c944fd8e4460adcb4be62ac6bd57a723f1ae SHA-256: 6f83e3d0a38a7a929cdae48c0810b38be52913739268fd5467e2650348e24313
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 pointing to Weebly-hosted PDFs, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=donkey+in+heat
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/6420091.pdf
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f872e6888115.pdf
    • https://cdn-cms.f-static.net/uploads/4479902/normal_5fa96c3f65f70.pdf
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/9670924.pdf
    • https://jixisejilikabow.weebly.com/uploads/1/3/4/2/134265892/aac8f307.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc681d1104edf1d77a7ddee/t/5fc6d1161d689b68bf884377/1606865178287/wells_fargo_mobile_deposit_adjustment_mean.pdf
    • https://static1.squarespace.com/static/5fc5c12b92c50b1a1e98b3c9/t/5fcb30fa393ce473562fa551/1607151867396/battle_tank_nes.pdf
    • https://static1.squarespace.com/static/5fc0f33f2cf09257bd6c4f7e/t/5fc1d586173fb5383be614c9/1606538631411/52754332842.pdf
    • https://static1.squarespace.com/static/5fc7979cc2869f0c81c41b6b/t/5fd727a9df2f0204c24fe325/1607935913611/next_century_mathematics_precalculus.pdf
    • https://static1.squarespace.com/static/5fc0e9e3bda9c57a97be47bf/t/5fc1898f145a8629dceacf7f/1606519183619/79250363135.pdf
    • https://static1.squarespace.com/static/5fc69f2da8793968642fe136/t/5fca00a5196a600d3c36cd70/1607073960964/guxuxekijela.pdf
    • https://uploads.strikinglycdn.com/files/1cd90b78-d0b1-4371-a19f-97478ed8e7b6/xawosekuseki.pdf
    • https://uploads.strikinglycdn.com/files/35ab9c2d-9f12-4be0-9ae9-ad4dc5f27df9/denozurun.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df16.bin
2131ff918b3fecee8a865259c70437cf3fee9262184d2da45aed5d2acd56e2f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 30520 bytes
font_01_sfnt_off00013db1.bin
cf3571f59945aae4b49458423705bce0472258d9e15a420a0adc7799de3f1238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB1 4632 bytes
font_02_sfnt_off00014d84.bin
2e5dbd4ef50ac551d55da1edc9440ec4770ebc9819c59ee03eb0e5e4d652df11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D84 11368 bytes

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