Malicious PDF — malware analysis report

Static analysis result for SHA-256 a985cae51affe55c…

MALICIOUS

PDF

77.3 KB Created: 2021-02-15 11:08:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 548b355211a5bc36aae16f88748712b9 SHA-1: 9e84814735545fc9992bd9134bdd07103058f1f2 SHA-256: a985cae51affe55cea40fe03baf6e3c3c963101404488bd50ad818c484c988d6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a summary title, likely serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=zero+hour+illustrated+man+summary PDF link annotation
    • https://cdn.sqhk.co/gigijuke/Hdhi3l3/94799207997.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/gOZgmgh/43429448425.pdfIn PDF document text
    • http://palejep.22web.org/boss_baby_2_free_mp4.pdfIn PDF document text
    • https://xobalodag.weebly.com/uploads/1/3/0/7/130739625/3116891.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/RgisgfT/wise_son_of_zeus_and_europa.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/8111657.pdfIn PDF document text
    • https://cdn.sqhk.co/feneradebeza/jjcZuha/43999205963.pdfIn PDF document text
    • https://finazevad.weebly.com/uploads/1/3/0/7/130739247/lipojunerux_kavixit.pdfIn PDF document text
    • http://talinab.iblogger.org/53190342080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wofaxil/coming_soon_template_html5_responsive_free.pdfIn PDF document text
    • http://wokikeka.epizy.com/searching_objects_games_free.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_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 5124 bytes
SHA-256: 35f21e06c14374244285f4bb00d3f831414f1bd6f5f34d48afbfe4714db6140c
font_01_sfnt_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 11024 bytes
SHA-256: 68ca8c3cf3ce39bc73018010c1cebdc15c2f168e4b479b008a172ae90942bad0

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