Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6acbb1241c3bf19…

MALICIOUS

PDF

68.3 KB Created: 2020-12-06 14:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 143770e752cfdefdb1d17cd3bbf15216 SHA-1: c5a138d1d9781768f07000cbb4a85dd9fcbad6d6 SHA-256: e6acbb1241c3bf195763427e9b27926b4f64d0494c7db4ec11b1c93270ed3cc6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL and the link farm heuristic point towards an attempt to direct users to a malicious domain for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/strik?utm_term=cogic+affirmation+of+faith+pdf
    • https://cdn-cms.f-static.net/uploads/4393515/normal_5fbc1f327b629.pdf
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/magawapikov.pdf
    • https://vakesefujes.weebly.com/uploads/1/3/0/7/130739027/wapineguwop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/36ef0d3f-db3b-4def-91ab-cb6ebd46d4ae/9208221760.pdf
    • https://s3.amazonaws.com/tanikanaw/rudesanosunadinosisan.pdf
    • https://uploads.strikinglycdn.com/files/f9c67518-7fb8-4149-bf85-8fad9ded5815/netflix_gift_card_pin.pdf
    • https://s3.amazonaws.com/punurum/benilowabagawero.pdf
    • https://uploads.strikinglycdn.com/files/79eb822e-9b64-49b0-a7ed-cd28c75b183b/best_apple_watch_apps.pdf
    • https://s3.amazonaws.com/xanebavifamopez/lepemuxetikuxekabowidor.pdf
    • https://uploads.strikinglycdn.com/files/71aa9ed3-6ab2-42e4-9f8d-28a0e8c71cbc/clash_of_clans_valkyrie_upgrade.pdf
    • https://uploads.strikinglycdn.com/files/c8b2c761-861b-4f6f-858a-c4c1d3d36c4d/menoporasofulafoxol.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf4.bin
44952abf3fdc1edce5ace168bef547caec10bf4080e984a7594d1fc915f80be1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 5264 bytes
font_01_sfnt_off0000dfba.bin
47e6fc259adb9aba7a3be1c71c04bb721adbf22fa567ce36b82cfdb8bbe421c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 10912 bytes