Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab14a266693c7cdb…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 09:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11aaa6bd3bddb8981faeaa22f47c9eb2 SHA-1: 4451ce9374771fffa072b0299f477c7bf44b46fa SHA-256: ab14a266693c7cdb78f587e87b84c4fa39614da8da5d518d235c127825992892
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://qianxish.com/ckfind_image/files/fiwumefikikewaweba.pdf
    • http://leebyunghun.kr/new/upload/board/files/94086788686.pdf
    • http://e-instar.com/userfiles/file/kixilawoku.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/xosipabijazujexorosemum.pdf
    • http://lovelyspa.net/ckfinder/userfiles/files/gobowu.pdf
    • https://discovercefalu.com/_data/images/file/79916620097.pdf
    • http://zaun-produzent.de/userfiles/file/bexusafifa.pdf
    • http://taemyung.com/data/upload/file/61964356835.pdf
    • https://tspinstruments.com/cache/fck_files/file/16019651312.pdf
    • https://lhorizon.ca/uploadHorizon/file/33066747036.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/27122883900.pdf
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/ganazapipulileru.pdf
    • http://rujiahk.com/uploadfiles/file/fezizewafopigasefab.pdf
    • http://hani-bee.com/userfiles/files/77029749718.pdf
    • https://curewelldiabetes.com/userfiles/file/lezefixosado.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/pedorenuwafurewazo.pdf
    • http://toyotacri.com/userfiles/files/xogosobigufedogovenomaz.pdf
    • http://mallncart.com/userfiles/files/60168238902.pdf
    • https://tadimtursu.com/image/files/durulebuzuweruwipa.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d6f9feb87bf1440019dceb1ca396d5bb/bovumaki.pdf
    • http://guidesdugrandlarge.fr/images/import/file/98188881023.pdf
    • http://harnettcountyhba.com/userfiles/file/vogisiwaz.pdf
    • https://pacientes.quiroser.com/UserFilesQUI/file/ziwokazotawi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=90k+house+bloxburg
    • 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_off0000adb0.bin
0bc19213059b23e7d103230c1e576e690d0bb05dc94aea66506738b22f131cb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADB0 10556 bytes
font_01_sfnt_off0000c5ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EC 16792 bytes
font_02_sfnt_off0000ddfe.bin
867992efbf676159a6afd8000c30dbb633c79cab6d047a103f0a030676a7e2af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 15684 bytes

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