Malicious PDF — malware analysis report

Static analysis result for SHA-256 7803dd42e507ef69…

MALICIOUS

PDF

69.5 KB Created: 2020-11-24 18:59:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b56af3d7652d652307358b9c2688878 SHA-1: 4ca22189406014c5f98b66656303be493bcea9e5 SHA-256: 7803dd42e507ef69e9d73786f33cb80357f2b2ebf19377750d2b99b6d2cb74b6
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, suggesting it's designed to redirect users to external sites. One such external URL, 'https://trafftec.ru/aws?utm_term=allman+brothers+melissa+piano+sheet+music', is present and likely serves as the lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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://trafftec.ru/aws?utm_term=allman+brothers+melissa+piano+sheet+music
    • https://jexolelogirif.weebly.com/uploads/1/3/4/9/134901145/da9c855e028f4b.pdf
    • https://fetesebi.weebly.com/uploads/1/3/4/8/134896421/nimodetukazaka.pdf
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/4108359.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7c4f07eb-a42f-481d-8169-f0f70f2c2ec3/fumubegokazibaluzefarived.pdf
    • https://uploads.strikinglycdn.com/files/5a811add-25d3-4221-91af-61035c59d959/mohu_sky_60.pdf
    • https://uploads.strikinglycdn.com/files/6d6258e3-ad19-4483-a817-94e1fc6127bb/pajib.pdf
    • https://uploads.strikinglycdn.com/files/dc02422c-7b42-47e8-a07a-78c5af6213c4/anime_raws_official.pdf
    • https://uploads.strikinglycdn.com/files/e025fd99-a3b0-4cd1-89b2-4954ceb9f1f2/d16y8_engine_wiring_diagram.pdf
    • https://uploads.strikinglycdn.com/files/83ea025d-ba8c-4d1b-8699-b3a4fb84302b/my_ford_benefits_tesphe.pdf
    • https://uploads.strikinglycdn.com/files/7f4f3740-3753-4e9a-b287-0a03230ca11c/storia_della_bruttezza.pdf
    • https://uploads.strikinglycdn.com/files/5780cc36-a4d9-4254-8ddd-6412087a1479/wogusozuwabesajopibezir.pdf
    • https://uploads.strikinglycdn.com/files/4ffedcff-8eb0-4f40-9e98-95065572fe9f/rasupogelefede.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_off0000c35c.bin
6d0a8ad7320892b57a495145a7f0b287332afa363af9faf8125e2ca92343a4e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC35C 5184 bytes
font_01_sfnt_off0000d4c0.bin
ea4dd85c23de4ace08c7fab552a08454ad6beb85f1b116adcdc99bb1957e28f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 11268 bytes
font_02_sfnt_off0000fb22.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 4324 bytes

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