Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6f18e4e76266fe…

MALICIOUS

PDF

86.2 KB Created: 2021-09-10 12:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9265aaa6ad097b8243490c297bfed3d6 SHA-1: 15d138d843dedbaf75a5670b389faf0f25c925fe SHA-256: 7a6f18e4e76266fe88b4873f4137c3b15756a7af8e0257686218f75eb2b8af5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external URIs suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cerezolorente.com/files/cerezolorente/_repo/file/28053564919.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed864c521---wibemepasavelugusokuved.pdf
    • http://kemenyseprosiklos.hu/upload/file/sezefetigosinadekofumig.pdf
    • http://controlsystemco.com/cache/fck_files/file/jujotutuxabuval.pdf
    • http://isleford.com/filespath/files/20210908030853.pdf
    • http://imreelectric.sk/uploads/file/30562598854.pdf
    • http://eluvial.com/sites/all/sites/eluvial.com/files/85587330213.pdf
    • http://zechnerbau.at/images/content/files/19352127565.pdf
    • http://joltiy.ru/uploads/files/pusawubozezetir.pdf
    • http://breakevenpoint.pl/uploads/editor/file/wezupazotevawi.pdf
    • http://abyss.sk/userfiles/file/40384614519.pdf
    • http://gjbbang.com/userData/board/file/83755255129.pdf
    • https://incense888.com/uploads/files/202109081125386420.pdf
    • http://hanilkwanla.com/uploads/files/nitulisulitaro.pdf
    • http://akcjonariusz.com/UserFiles/file/dofavanutekowazuzit.pdf
    • https://fasaac.org/temp/files/sumapasamame.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/nkaoe5go2bqq2eqg0tre5ur2ag/lalerinumowilorapar.pdf
    • https://tedesco.pl/userfiles/file/9361581016.pdf
    • http://yieldpharm.com/upload/files/48981972263.pdf
    • http://bburago.info/admin/fckeditor/userfiles/file/84183142181.pdf
    • http://hyunsin.net/userfiles/file/60564108076.pdf
    • https://halkapsikoloji.net/userfiles/file/befibarufinerasikedi.pdf
    • http://bevillelecomte.ovh/ckfinder/userfiles/files/64644009290.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hbo+max+apk+latest
    • 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_off0000eaa7.bin
cf64308b5102eae31b26d9cef7564818c965ffaa4816f429b08e1758e002a9d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 18868 bytes
font_01_sfnt_off00011bbd.bin
d8ff9947de455f480dfed1e1d60ecb6794b3c444820e7e453643a472aa1296b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 10444 bytes
font_02_sfnt_off0001334b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 16792 bytes

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