Malicious PDF — malware analysis report

Static analysis result for SHA-256 8661d94cb2176e9e…

MALICIOUS

PDF

65.0 KB Created: 2020-11-21 02:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e424eddc51c8f86c2d4511607c3edc0 SHA-1: 54ea43d136c80ddcf0ac5350a3ac9feb62196d62 SHA-256: 8661d94cb2176e9edb0ca84f502c7733bb0a5f2fd991ea3038062a4a0e3c9084
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a potential phishing lure related to business income worksheets. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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://trafftec.ru/123?utm_term=business+income+worksheet+fillable
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f99e06f0588c.pdf
    • https://resumasilazivo.weebly.com/uploads/1/3/4/5/134509929/1731257.pdf
    • https://gitinegu.weebly.com/uploads/1/3/4/6/134648864/vevarebanamamozev.pdf
    • https://cdn-cms.f-static.net/uploads/4419225/normal_5f9a0b3f5721d.pdf
    • https://cdn-cms.f-static.net/uploads/4471273/normal_5fa536f071eec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2c3b45c1-457f-4e44-9dd2-0fa9acb9c597/93643745324.pdf
    • https://s3.amazonaws.com/sizadagazagaj/reporting_someone_fiddling_benefits.pdf
    • https://s3.amazonaws.com/senodiw/magic_photo_editor_backgrounds.pdf
    • https://s3.amazonaws.com/lusabifef/gexuwupumo.pdf
    • https://uploads.strikinglycdn.com/files/c37d90bd-fc22-4dce-8ea2-138bf581b7ce/futimozabixabunulog.pdf
    • https://uploads.strikinglycdn.com/files/e636ffe5-b2a7-422e-92a7-a9739ae18776/law_of_attraction_planner_freedom_ma.pdf
    • https://s3.amazonaws.com/tumasun/fallout_shelter_hacks_for_android.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_off0000c2b4.bin
1e684aba2b2feca7b8647c51f0e914327e2e204c051d3240269fbd8fb7d59d58
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B4 5464 bytes
font_01_sfnt_off0000d538.bin
fbf110870fa80793f3690556ad81d93e8b6f1fde098ad4724c19c162aef2fa2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 9964 bytes