Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d78b28bdb76c90…

MALICIOUS

PDF

91.0 KB Created: 2021-02-12 08:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3530acd7cf3cacb9ff732f4095f7cee6 SHA-1: 35639eb8c6a8ebb15bb03e4d8e46da9a69ca9fe7 SHA-256: c4d78b28bdb76c90f72dea3fea4e8116ee7577959be2dc0f0c4e47858fbd73ae
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=german+shepherd+and+rottweiler+mix+dog PDF link annotation
    • https://cdn.sqhk.co/xisalaximel/EhjgAii/nedew.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/rosikalaxojapujezazelaraj2gqoy.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/aejdihD/33346334531.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/7WTZBUp/silajowatek.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/JKjaZia/next_fight_night_video_game.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/ii4bigp/31355182299.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/K6Vangd/iptv_gratuit_pour_android_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/L5Uhaih/ruvepegelulimot.pdfIn PDF document text
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/mumaver.pdfIn PDF document text
    • https://gikemadisasov.weebly.com/uploads/1/3/4/6/134667176/sozexo.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/ha9hhge/foundr_magazine_net_worth.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/fjchfMk/fikogupijukog.pdfIn PDF document text
    • https://cdn.sqhk.co/ziveluki/mjjFgha/brave_soul_chunky_trainers.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/japanese_apron_pattern_freeope6s.pdfIn PDF document text
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/jufoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://digegaleviverab.rf.gd/xobedafizuvidimub.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_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 5564 bytes
SHA-256: 1e89f16f5aa746db4a4ef598087a18123c17f8a9c17a71251383e7b220d1842e
font_01_sfnt_off00013b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2D 10344 bytes
SHA-256: bb7eb065ccfbe052e3ede16c416042131e322f9e741e110728218d7b57eb9411

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