Malicious PDF — malware analysis report

Static analysis result for SHA-256 459eb159f589a201…

MALICIOUS

PDF

75.8 KB Created: 2021-02-20 09:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03c148751660fe5ee4b2a984b33a8146 SHA-1: 26bd7726de3152c3ca5f57c0066fe21ef9407897 SHA-256: 459eb159f589a201166bd579237a5186142cd11088149e1c7a38a91da033a151
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and ClamAV detected it as a phishing trojan. It contains a large number of external links, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure for an 'animal cell structure worksheet'. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=animal+cell+structure+worksheet
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/ab9fa9867929bd.pdf
    • https://static.s123-cdn-static.com/uploads/4388833/normal_5fcaf6e81261f.pdf
    • http://raisinsapp.club/749631303925xqk0.pdf
    • https://cdn.sqhk.co/lojibuwe/fGOidic/82185180455.pdf
    • http://mastericy-chistoty.ru/stickman_rope_hero_2_unblockedwsc5s.pdf
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/dbece98a050c.pdf
    • http://fb-ig-copyright.com/oracle_api_platform_cloud_service_reviewkwcgd.pdf
    • https://static.s123-cdn-static.com/uploads/4490375/normal_5fe32e6a6e6e6.pdf
    • http://indir-kazan.com/zifusemezeweponomab0xxtk.pdf
    • https://getukesi.weebly.com/uploads/1/3/4/7/134735407/1723790.pdf
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/kewigudawugila_sibapis_pusekuduxonip_bosigesu.pdf
    • https://cdn.sqhk.co/tezasevimab/cMFIhYS/ps4_vr_lens_cleaner.pdf
    • https://cdn-cms.f-static.net/uploads/4385847/normal_5fe77620a5dd2.pdf
    • https://cdn.sqhk.co/raninogozo/ejjjdge/zivib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fojaxexino/audit_report_format_for_trust_2019.pdf
    • https://s3.amazonaws.com/tikofaketonub/patizebusawiz.pdf
    • https://s3.amazonaws.com/nitatotol/11374780329.pdf
    • https://s3.amazonaws.com/pazovugal/38272937021.pdf
    • https://s3.amazonaws.com/levumoduf/worksheet_about_countries_and_nationalities.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb69.bin
cdc12ad6c59afa28ff77d10a6aaf13228024ac6c92dd01479c232d8f5a90f333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB69 5184 bytes
font_01_sfnt_off0000fce9.bin
988dab72f85d4bc3c644c762aed11d89817b99d5f6bce965c57d7c0f650974bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 10992 bytes

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