Malicious PDF — malware analysis report

Static analysis result for SHA-256 bface6c23c976442…

MALICIOUS

PDF

75.4 KB Created: 2021-01-25 15:07:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3f6cc893c54c234530f84482b3c0f1ef SHA-1: edd8de28a7e6d760017c6e7f3a538c71473e0c9a SHA-256: bface6c23c9764428448d7cbf1fba6cc8da85cb5efb98eeda20a4c61445e6cc1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic indicating a link farm on disposable hosting suggest a phishing or malware distribution attempt. The document body, though heavily garbled, contains keywords related to drivers, reinforcing the lure.

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://trafffe.ru/aws?utm_term=driver+asus+x455ld+windows+10 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490250/normal_5ffc96b602372.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/branson_mo_shows_october_2020a93vl.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/BPgf37C/xuzerelaxotukup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471250/normal_5fd0646cd9321.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/bexups4ryg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444357/normal_5fef46ef9c6e6.pdfIn PDF document text
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/gojozesubazozu_mugule_jujodero.pdfIn PDF document text
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/lutel.pdfIn PDF document text
    • http://operationhomeplate.com/survival_rate_stage_3_breast_cancer_lymph_nodesih91p.pdfIn PDF document text
    • http://ideal-it.fun/adventure_motorcycle_pants_and_jacketjyfnv.pdfIn PDF document text
    • https://cdn.sqhk.co/javijaxim/jcOiiSr/77704873434.pdfIn PDF document text
    • http://edevletorg.com/business_administration_degree_minor_in_accounting_jobssvxqg.pdfIn PDF document text
    • http://adanakebap.org/18971981968h0zmp.pdfIn PDF document text
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/43872e519d5e592.pdfIn PDF document text
    • https://sawuzirerepobod.weebly.com/uploads/1/3/4/0/134040369/konaxev.pdfIn PDF document text
    • http://firstdoctor.xyz/iced_green_tea_latte_starbucks_review2lk5d.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/vBhfheQ/dude_perfect_stereotypes_quarantine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 5248 bytes
SHA-256: 002a281f48ddcda75d3db2ace411d388408fccafdbdc6b5e0fe01a92b2c8bcdf
font_01_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 10388 bytes
SHA-256: d99d167ad5376354ea6d1d84c142a97f6080b901867c5f9d5d3296f004781643
font_02_sfnt_off00011214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11214 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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