Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fee1f54d149def…

MALICIOUS

PDF

73.6 KB Created: 2021-02-09 08:02:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: cac1f6ef97154d4879be4451c096996a SHA-1: 701c9c88bdf8cfb0f5801755accefcebe973b124 SHA-256: 13fee1f54d149def69a6516f7907e33747a5e7d7ca977feab2486b4dbe44e79f
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the PDF is a link farm on disposable hosting, reinforcing the malicious nature. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest it's designed to redirect users to malicious sites, likely as a spearphishing attachment.

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://jacksth.ru/123?utm_term=self+portrait+poem+template PDF link annotation
    • http://creditscorecard.info/adventure_quest_starting_guideno0dd.pdfIn PDF document text
    • http://bestrongbyg.com/34536351866zwehi.pdfIn PDF document text
    • http://wrinklestiltskin.com/60021759621hhcwr.pdfIn PDF document text
    • http://apelsins.space/93946849279xavvv.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/costume_store_near_me5ohs7.pdfIn PDF document text
    • https://lujukote.weebly.com/uploads/1/3/2/7/132712447/5670407.pdfIn PDF document text
    • http://libralab.digital/57384918358v3vrr.pdfIn PDF document text
    • http://waystep.site/alberta_infant_motor_scale_score_sheetxcvoo.pdfIn PDF document text
    • http://help-nanny.site/giwamapubugexarage96qz.pdfIn PDF document text
    • http://mon-cmbretagne.com/engineering_mechanics_moment_of_inertia6cy6a.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/bogeguva/wemefefitexirokotisu.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/big_ideas_math_advanced_1_book_answers.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_off0000e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 4972 bytes
SHA-256: e7b5325fd6ce40e0068045feaed03a4afedf595d69455b41d242ea2c3266db94
font_01_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 10692 bytes
SHA-256: 4edf0895362475ee5ec6fd03a7c0e6802060f7a117a8e54032f07cd23c4c9404

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