Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cebf346b6479e9e…

MALICIOUS

PDF

78.9 KB Created: 2021-02-12 16:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 2818a5da61c18a441e09a55b11f39c04 SHA-1: bf519901241cecc5ee5b6c080a5aa33f2a5e0b00 SHA-256: 4cebf346b6479e9e4999f0a7d3cc7c12305c12399c21864e4e63bf4cee929a95
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 pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata that aligns with the presence of these external links.

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://maypoin.ru/wix?keyword=toshiba+fire+tv+edition+manual PDF link annotation
    • http://kewisanoxiv.66ghz.com/entertainment_one_ltd_annual_report_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/zikonidenijo/GpmgjBd/19444277159.pdfIn PDF document text
    • http://helplnstagram-confirm.com/999554503724ucdl.pdfIn PDF document text
    • http://tibojisitixuno.22web.org/wadedukigi.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/jex4Vhb/red_velvet_cake_homemade_easy.pdfIn PDF document text
    • http://wemepena.iblogger.org/files_to_sd_card_apps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_601e4e4b5a5c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_5fd9f06072474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403674/normal_5ff40639bf47d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5ff7777e004de.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/8piiZJ2/selibikovudotafituxukiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/zolaxadivowe/ccjihij/cop_car_simulator_game_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_600a8ac51b652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501656/normal_601bfec84bb14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_601e33d8659a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://melewurimepuja.rf.gd/bubbles_game_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 5296 bytes
SHA-256: f7a553b909452b6ab1c7f13cbd5e1c28e67a1095f63a3111beeeb4866b6a45a3
font_01_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 10652 bytes
SHA-256: 1c95498104b58badc86a12cf4763a4f0f72802a6a6e8828de93a09b1744d9868

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