Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba15b66a782c8d9…

MALICIOUS

PDF

73.9 KB Created: 2021-02-26 05:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4125eede5c4909b03e2685e766f87308 SHA-1: 55773a94f76422c66350ab2e645912bd4a4f5640 SHA-256: 2ba15b66a782c8d9033ec11affe2f04c9bc2f2abbcc91fe7ec7f365b2d4b2336
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting services, suggesting a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a tactic to obscure malicious destinations. While no scripts were extracted, the presence of external URIs and the ML classifier's high confidence score support the malicious verdict.

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://jacksth.ru/123?utm_term=rules+for+adding+subtracting+multiplying+dividing+negative+and+positive+numbers PDF link annotation
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/tubewom-funovukigafizaw-jusisu-tawosonibileman.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/lghes0V/fapegotigokivunufoxumamit.pdfIn PDF document text
    • http://parrrtner.xyz/free_club_flyer_templates_psdfgjww.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/Q3iehcf/twice_glitch_live_wallpaper_apk.pdfIn PDF document text
    • https://xeronatorelej.weebly.com/uploads/1/3/0/8/130874120/3304176.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/jahhjb2/98653437115.pdfIn PDF document text
    • http://xenuven.22web.org/avast_cleanup_apk_uptodown.pdfIn PDF document text
    • http://reduslim-shop.website/sea_of_thieves_codeimdok.pdfIn PDF document text
    • https://ruvudiroxutorag.weebly.com/uploads/1/3/0/7/130775702/dajevepogoxukubamu.pdfIn PDF document text
    • http://forsage.pw/brother_hl-_l2321d_laser_printer_driver0yj33.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/jgjjvjh/gag_reflex_testing_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490244/normal_5fd8d986b3cee.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/nuxulikiwab/autobots_transformers_2.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/daniel_boorstin.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/subokumexoxirofura.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_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 5784 bytes
SHA-256: 45e7c5a5b843932de58cfeffe855d2e77c67c22dc802e2ef288b9db80a5ec6cb
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 11252 bytes
SHA-256: 5a0d7167a5c64ab8b8b11807b32b1657b6a72489c5103a2e11ae6f586e3ec5f4

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