Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dfcdba870c61c4…

MALICIOUS

PDF

75.7 KB Created: 2021-03-04 04:26:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8c5add12b8526d58fba3383b62a9bf02 SHA-1: 5aa275fe2587778bce034e1219b3bc3e636fb6d9 SHA-256: a6dfcdba870c61c4442df47f47a8ee68ca6470a0e351d23897fd354a553bee72
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs, including one that impersonates a game mod download, likely serving as a lure to redirect users to malicious sites. The presence of multiple disposable hosting links further supports a phishing or malware distribution scheme.

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://resalured.ru/123?utm_term=metro+2033+redux+multiplayer+mod PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413017/normal_60059f2d76ea9.pdfIn PDF document text
    • http://digtalcaliper09.xyz/free_heart_templates_for_appliquefajet.pdfIn PDF document text
    • http://top-agent.ru/28736998581lt4qc.pdfIn PDF document text
    • http://elerctum.org/what_is_the_message_of_the_poem_fire_and_ice_class_10oahcw.pdfIn PDF document text
    • http://thecet.xyz/xtralis_adpro_softwarebg2gi.pdfIn PDF document text
    • http://discount50it.pro/mimpi_basah_saat_puasa_apakah_batal_atau_tidak5jay1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499995/normal_600ffddda8766.pdfIn PDF document text
    • https://pasezoxe.weebly.com/uploads/1/3/5/3/135347718/tujakudub.pdfIn PDF document text
    • https://tozadifoxu.weebly.com/uploads/1/3/4/9/134904498/80d1dff.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/7ibjdid/wildlife_rescue_los_angeles_ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473384/normal_5fff03f621b30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wotadow.rf.gd/21676272108.pdfIn PDF document text
    • http://wepezip.epizy.com/bubalemoxixex.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_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 5540 bytes
SHA-256: 07a9141b9a9231af0eafe37c5b5d1284ca621d5424d52f188a5a98ef3504d206
font_01_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 10624 bytes
SHA-256: 0c19fd0b5fd0823ba6ad1f4e28d897247e3e7cda3599163d7ac3c0bf8f2777ea

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