Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cb42074f731fc4…

MALICIOUS

PDF

79.7 KB Created: 2021-03-23 18:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5a920a84a1517eccf5a53ed34b422db SHA-1: 72aa4ec2d89aff359de9098ea3b25b58833b1c04 SHA-256: 99cb42074f731fc4b66644ee0985c0e6ad3d64a9a49864771cc8a215ebea4776
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

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://dafemum.ru/award?keyword=artesunate+administration+pdf
    • http://kodiwedo.22web.org/64007781192.pdf
    • https://cdn-cms.f-static.net/uploads/4480886/normal_604d99bb40748.pdf
    • http://kvyovk.xyz/fozilijidf2vs.pdf
    • https://static.s123-cdn-static.com/uploads/4401989/normal_5fe1c09a60787.pdf
    • http://wumewil.sportsontheweb.net/love_languages_quiz_free_printable.pdf
    • http://lnstagram-verifedbadge.com/24640175558mzupw.pdf
    • http://idealsit.space/kitojilafiuvcat.pdf
    • http://pijojavoto.mygamesonline.org/sezigavebogopo.pdf
    • http://gedawuxofawu.iblogger.org/italian_carabinieri_uniform.pdf
    • http://jukofokunazevam.iblogger.org/ladiz.pdf
    • https://cdn-cms.f-static.net/uploads/4461484/normal_60200a87c55c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zepedijuva.epizy.com/annotates_windows.pdf
    • http://puwekaxaxowiza.epizy.com/lofobizilajan.pdf
    • http://bajekixizosi.myartsonline.com/83442623879.pdf
    • https://uploads.strikinglycdn.com/files/30ec17ef-610d-4268-aacc-7ccce9c9f48c/is_the_green_mile_loosely_based_on_a_true_story.pdf
    • https://uploads.strikinglycdn.com/files/6d338636-3f14-4a5e-8dfb-c6c442d1c136/vobipepazorudoxoxiv.pdf
    • http://pimuxexud.epizy.com/clear_score_credit_report.pdf
    • http://nofegogimulat.rf.gd/rojuvuzipezunufe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e466.bin
db851822a30467ab9224a6eacbe03a3784a877c281fb7da66b4037103779ff71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 5144 bytes
font_01_sfnt_off0000f5ce.bin
4d9343bf0d5045b4d3702b3a875f77c8806f6fbfb5f63bc276a2f2fc0342b119		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 10932 bytes
font_02_sfnt_off00011b58.bin
c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 16060 bytes

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