Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc826a1fe31088c…

MALICIOUS

PDF

84.5 KB Created: 2021-02-10 15:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 194d9d9812d1cef20039a94f89b958b8 SHA-1: 7657fa766dcaa27a99ceb5677d0ffb85e3bdc4dd SHA-256: cfc826a1fe31088ca5450a41da7eb4098e7b4a0424b558a9661564b9e33bd048
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs indicates tracking or campaign-specific lures, reinforcing the phishing or malware distribution intent.

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://seumenha.ru/123?utm_term=ghana+mali+songhai+map PDF link annotation
    • http://smartbright.club/beowulf_graphic_novel_sparknotesby02i.pdfIn PDF document text
    • http://adanakebap.org/chander_pahar_novel68teg.pdfIn PDF document text
    • http://swiss-gear.store/woxonasexemavitc2z9l.pdfIn PDF document text
    • http://kadazid.22web.org/newijujolalefikepe.pdfIn PDF document text
    • http://blognews.top/20105096944rm2os.pdfIn PDF document text
    • http://copyrightproblem.com/plague_inc_apk_premium_1._16._3td22c.pdfIn PDF document text
    • http://urott-hu.com/beyblade_burst_rivals_videoswawvh.pdfIn PDF document text
    • http://amorexpo.com/xedigakosimexotedudotenikg5mu.pdfIn PDF document text
    • http://keep-travel.com/loximaf8jogw.pdfIn PDF document text
    • http://optarfes.com/best_comic_book_animated_seriesimctw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rimejaje.epizy.com/64067424153.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/dilani.pdfIn PDF document text
    • http://tozoxefig.rf.gd/king_crimson_discipline_album.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/free_mp4_movies_for_android_app.pdfIn PDF document text
    • http://robinovedibepo.epizy.com/zivupadusat.pdfIn PDF document text
    • http://soriwolawiri.epizy.com/human_body_parts_images_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 5168 bytes
SHA-256: 376ebe1a0b7e2a81087de8d80dfdf66b6be0697f7c1806c694ec3c9f7ad392cc
font_01_sfnt_off00010a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 11072 bytes
SHA-256: 95bd7a1ad95a7c4ad31e6d2c157b488d1ed4e72786840caa44ce001f692e224a
font_02_sfnt_off00012fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 16076 bytes
SHA-256: 329a2ad8375db4c835ca1b908318827b7826730af459423ce6470d445ef5a137

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