Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba50670010781067…

MALICIOUS

PDF

71.4 KB Created: 2021-02-20 13:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1c1a46349dda24605b7b441f5a89f1ae SHA-1: 0dc7b07e62e000df61f70160140979cc8f737863 SHA-256: ba50670010781067956894b39feb6d52ef90b3734e06db66c83ff42a06b0971f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to product information, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wb?keyword=chamberlain%20liftmaster%20professional%201/2%20hp%20light%20bulb%20replacement PDF link annotation
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/8199975.pdfIn PDF document text
    • http://fujuvujazapoko.22web.org/87146496068.pdfIn PDF document text
    • http://wujasoxi.22web.org/berliner_mauerweg_gpx.pdfIn PDF document text
    • http://firejifanop.iblogger.org/29839874344.pdfIn PDF document text
    • https://dagolitufewanat.weebly.com/uploads/1/3/5/3/135345669/8112998.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/c9b64.pdfIn PDF document text
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/xalabutov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://valapapiwusujeg.rf.gd/pejibemunemifuxilir.pdfIn PDF document text
    • http://lafanibawonol.rf.gd/kogizozi.pdfIn PDF document text
    • http://nikavavufuxirel.epizy.com/bemedalikamikerevuve.pdfIn PDF document text
    • http://gerosopidazab.rf.gd/jusewima.pdfIn PDF document text
    • http://malosebetu.epizy.com/sintesis_de_bases_nitrogenadas.pdfIn PDF document text
    • http://vuzejonesiji.epizy.com/pml_chord_generator.pdfIn 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_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 5692 bytes
SHA-256: 5b0e44c061d466e41a0e4d701cfecb666be2bd3d0956b5e1a70768a955cace35
font_01_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 10144 bytes
SHA-256: 3e82e56547bbeb023ccb4c74d70b19d04d0904f9dbfe8d8fd30ba3460c34f0f8

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