Malicious PDF — malware analysis report

Static analysis result for SHA-256 0431d0f9717d64f0…

MALICIOUS

PDF

86.8 KB Created: 2021-09-20 18:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 147ea22c1bea18d3df869efd29540938 SHA-1: a4f8d4f5f7f840498d7e95db6a9019d97aa1a716 SHA-256: 0431d0f9717d64f0fa2fd914d4b1c235f586ee524aa2bdef1c0da93e29ef6252
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosts, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/40573224671.pdf
    • https://marblo.ph/app/webroot/img/files/80509620187.pdf
    • http://kxzyjy.com/CKEdit/upload/files/73312226549.pdf
    • http://scbczy.cn/up_files/file/20210906_103344.pdf
    • http://855solution.com/htdocs/cljr/data/files/wabanonejoveriwosu.pdf
    • https://floresdeserrezuela.com/aym_image/files/jojuwe.pdf
    • http://emilygrilltogo.com/uploads/files/vekasifopogiko.pdf
    • http://neodentpetrosino.it/userfiles/files/53858049620.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/219ccecde7a2df6a33449158887525bf/66116426694.pdf
    • http://ylpqzl.com/ckfinder/userfiles/files/taguxekoxunesanugu.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/xolatulamarotawu.pdf
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/37487902542.pdf
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/tuzaditalanakufefeg.pdf
    • https://digireg.ru/upload/wozimonaluzod.pdf
    • http://mayinmaunhat.com/upload/files/48716909851.pdf
    • http://kesifveotesi.com/files/fawimojibane.pdf
    • https://carparts-fixture.com/file/file/wimodufufoj.pdf
    • http://portamarioarchitetto.eu/userfiles/files/kurogowaf.pdf
    • https://bostoncake888.com/UserFiles/files/rosekasawasomedu.pdf
    • https://atlantidegattico.it/file/98099725150.pdf
    • http://alisawedding.com/upload/users/files/87694939063.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=after+we+collided+full+movie+free+streaming
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0f.bin
52d53751b80808719991db309b23fc1ac98054d0c9fb3e6462bfb90695fa2a3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 11052 bytes
font_01_sfnt_off000106a7.bin
ff01b8f05dca5a9d5c100b379ecbcb79d3672fe80276c6276c26fa71a0e0ab9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 18112 bytes
font_02_sfnt_off000135e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135E3 16792 bytes

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