Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab0236a00733553…

MALICIOUS

PDF

76.3 KB Created: 2021-02-28 13:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: acf65f2b427b583fc68afe70c6c5f618 SHA-1: 7bcccaa92089fbd6ac95c5561b3622c129a1be5d SHA-256: 2ab0236a0073355336fe10dd56bded55b2572a7c2e84c79e0a5745041f518428
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, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs, many pointing to disposable hosting services, and the document body, though partially corrupted, suggests a deceptive pretext related to product reviews. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially harmful 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://xajibur.ru/strik?utm_term=char+broil+big+easy+turkey+fryer+reviews PDF link annotation
    • https://cdn.sqhk.co/nojebimit/bx9MhaR/jurokirul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_5fd7cd62c74b5.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/dgd9h6R/squadron_bullet_hell_shooter_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417537/normal_5fcea143ea603.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/bigpTtm/1st_grade_teaching_reading.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408588/normal_5ffa2854ebcbe.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/ja0hg7C/68458939410.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/33150576116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_600e634f54280.pdfIn PDF document text
    • https://cdn.sqhk.co/mazonixun/qhfagct/teacher_heartbeat_svg_free.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/gR1Llij/gavugatajadatowim.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/linksys_re2000_blinking_light.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/xadaje.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/13345928481.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woranuganavot.myartsonline.com/gubulunetav.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_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 5392 bytes
SHA-256: a576619e7c30063c6516d500be9320d755903d5eb21f19ebc8e2e83881973529
font_01_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 10588 bytes
SHA-256: d90d401f39c2a53e4f0931a6331cb9af07e66399bcf727ee485928cf24563816

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