Malicious PDF — malware analysis report

Static analysis result for SHA-256 659c4ba72001d0e2…

MALICIOUS

PDF

76.9 KB Created: 2021-03-25 10:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce53901871bfbee8a1e6c525ef16637b SHA-1: 75ac45c7b72ce171c936cf958c8c19207ce682d7 SHA-256: 659c4ba72001d0e20218bb82f701fd3ce55cedaf9f02e9667e60ceab4645f841
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. The document body, though heavily obfuscated, appears to be related to a service manual, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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://resalured.ru/wix?keyword=2008+ford+explorer+service+manual
    • https://ketowijogi.weebly.com/uploads/1/3/5/9/135985413/kekidimubitotojaguka.pdf
    • https://rirenumu.weebly.com/uploads/1/3/4/8/134884077/razaxorum.pdf
    • http://fopokigife.mywebcommunity.org/29880240060.pdf
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5fd64d8d5792b.pdf
    • http://siwosupegejolop.medianewsonline.com/56747419517.pdf
    • https://static.s123-cdn-static.com/uploads/4383295/normal_5feb3805c8e56.pdf
    • https://cdn-cms.f-static.net/uploads/4445888/normal_6027e07ce8309.pdf
    • https://netokuwusava.weebly.com/uploads/1/3/4/3/134384506/4813ca2f44ee2.pdf
    • http://pumorux.medianewsonline.com/spider_man_comics_free.pdf
    • https://madafodem.weebly.com/uploads/1/3/5/3/135397102/e15276d5c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_212711b68223421a86310d8a90eca23d.pdf?index=true
    • http://bikufupok.rf.gd/maxof.pdf
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_e63af16b999e47c4a25743ee26f2bd10.pdf?index=true
    • https://uploads.strikinglycdn.com/files/de3b0985-d1a9-4eb1-a0c3-d3f0a61184d3/roluzufedikadodami.pdf
    • http://menimilerawapo.rf.gd/xaromozovokeb.pdf
    • http://kodejosukiraxel.rf.gd/96985720326.pdf
    • https://uploads.strikinglycdn.com/files/06ad7e57-8c8a-4f7f-9ccd-df88c8ad7f69/85446423503.pdf
    • http://wonanikapudidak.atwebpages.com/29155894248.pdf
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_3bccb8be694540c5b7dddd5303938a93.pdf?index=true
    • http://pusejik.epizy.com/45897746756.pdf
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_b3b3122d5ba34c73bb6032906eee14ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0f0c5be8-6d0e-4ff6-a619-11bd7f3e2227/sawefixorulu.pdf
    • http://romofimor.onlinewebshop.net/71544665253.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_off0000ee24.bin
f06bf3cac18ca403b5dade9a298c12dadfb1e61434f5da85b8f1ac8767d8b0a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 5800 bytes
font_01_sfnt_off000101da.bin
b2459a5030645d98c5823563dda42b09dd4316bcb935405e6d21c956d2373a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 10464 bytes

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