Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe9f57bcc34a297…

MALICIOUS

PDF

69.0 KB Created: 2021-03-21 23:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3b99b22a8dd43f145d5f88fa0103c49a SHA-1: 0e9cc303d6c39c772ac2a976ff6095e95b0bca58 SHA-256: dfe9f57bcc34a297f71fa00566ace22f497c984f403e94b946c65072641bcab7
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to 'The cask of amontillado worksheet pdf', aiming to trick users into visiting these malicious sites.

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://golowaki.ru/award?keyword=the+cask+of+amontillado+worksheet+pdf PDF link annotation
    • http://baderezu.scienceontheweb.net/genawebebamo.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/giijeT8/forsaken_temple_escape_room.pdfIn PDF document text
    • http://mebelintera.ru/beniregunimajeduwukikekxter.pdfIn PDF document text
    • http://dirozigumifew.scienceontheweb.net/bilofuwibunokudapinigov.pdfIn PDF document text
    • http://ostanni.fun/86863585503hj3bl.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/tatumunakadefidixevo.pdfIn PDF document text
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/1ee83f5f446c.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/iccicBq/54515619471.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/how_to_pronounce_zao_in_chinese.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/praise_him_forever_chords_chris_tomlinxvwqj.pdfIn PDF document text
    • http://xufopizaxeto.medianewsonline.com/theoretical_and_empirical_research.pdfIn PDF document text
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/dulisofawele-dokasewexune.pdfIn PDF document text
    • http://vajokopopozikem.medianewsonline.com/49632955274.pdfIn PDF document text
    • http://springwin.space/1000182719teltq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fogovulosuzan.onlinewebshop.net/38274703634.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/maze_runner_3_full_movie_google_drive.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC436 5288 bytes
SHA-256: 9c00e8c8a1817b1d7128a1caa84afd3d5d7e76a64ebbad07a5049f0e4c8b9e32
font_01_sfnt_off0000d611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 10264 bytes
SHA-256: ebde08a4785d636bfc77f225bd930b13149ea18011a0d330ed87e5d614e4f472
font_02_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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