Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be732ed21ad9755…

MALICIOUS

PDF

74.1 KB Created: 2021-01-25 01:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b2deda6a2cc8f644fdbf2072629df0b8 SHA-1: 748a75286747f061ab9f4f072116f83827279565 SHA-256: 7be732ed21ad9755947fc78eab1cb7a3f141b41814ab25bee84205548d415611
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to 'Odu course schedule' and metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content. Numerous external URLs are embedded, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of many links points to a lure for users to visit potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=odu+course+schedule PDF link annotation
    • https://cdn.sqhk.co/tedogegez/gjedQja/gosiwewoforemuwoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5fda9188e4443.pdfIn PDF document text
    • http://magic-spring.com/zaxabuxiwavdmsmx.pdfIn PDF document text
    • http://leree4.club/xasidodisa15tga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368767/normal_5ffa85afbaa58.pdfIn PDF document text
    • http://fakts.design/top_pickup_truck_philippinesp33hu.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/jhibGmF/16491166385.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403131/normal_5ffab644e79fa.pdfIn PDF document text
    • http://heleogose.online/racing_smash_3d_mod_apk_1._0._14z588t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381534/normal_5ffacd809dc2e.pdfIn PDF document text
    • https://cdn.sqhk.co/zeboxuze/lrLieSB/army_prt_recovery_drill_commands.pdfIn PDF document text
    • http://easylearning.space/33229318297gsfzm.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/jhZhjcG/define_lucky_coincidence.pdfIn PDF document text
    • http://ridunculus.com/henry_tropicool_roof_coating_reviewsjrsjq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_5fd28becc671e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 4844 bytes
SHA-256: 57a6d6b1d063e5979f9062ab1fbba29de42e4c4f1e14d0fefbb78f5ce89c3798
font_01_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 10904 bytes
SHA-256: 336befa36ae3d350931c1f95b1096ca61c0da7b0870f7fba58dcc83603a9b6f7

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