Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c80b3603540a0c…

MALICIOUS

PDF

82.8 KB Created: 2021-04-12 10:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 008c351ea2b08797a86130698816f0e1 SHA-1: 1db0ab1050853e18c5efce47af39d72323ce1b84 SHA-256: a9c80b3603540a0c63ba8425a7d6a79d3513f44224d0876af8ef25e4d0dcebd0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=american+assassin+trailer+reaction
    • https://pawagidi.weebly.com/uploads/1/3/1/1/131164052/gomerokim-wirerejavewe-vewiwewug.pdf
    • http://lukiduxipapep.mywebcommunity.org/vuxotubazeju.pdf
    • http://piwifeg.22web.org/nebaroposaxowopese.pdf
    • http://sokelekife.iblogger.org/79470156771.pdf
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/konirelodituw_balifizotaji_watorobive_podadibap.pdf
    • http://nibewubixela.getenjoyment.net/matepejazivexuf.pdf
    • https://busonuvawariba.weebly.com/uploads/1/3/4/3/134355681/zisofe-dararixukudulap.pdf
    • https://baduzasozem.weebly.com/uploads/1/3/1/4/131407439/bofugokulipixumowa.pdf
    • https://sinofokum.weebly.com/uploads/1/3/5/3/135316266/pilezezi-mabavowabiw-jugim.pdf
    • http://movoxazukum.22web.org/kokeduzu.pdf
    • http://xarapen.22web.org/64068283853.pdf
    • http://moxolesapudeli.22web.org/what_is_noting_of_a_bill_of_exchange.pdf
    • http://kexedeziferu.sportsontheweb.net/64764793160.pdf
    • https://rexajubimazon.weebly.com/uploads/1/3/4/8/134884463/dikezuso-xoravowekisofis-kamipevab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://felubumasosazi.epizy.com/78450957798.pdf
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_5224c83e165c40c2a3abed86186d5583.pdf?index=true
    • http://luselobek.epizy.com/xikijuluvob.pdf
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_3dfb2f3c62d543338ef3c9eb2eb62471.pdf?index=true
    • http://lisokabosexipep.epizy.com/32528293142.pdf
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_39ae9b7d69c248dab0cc5319ec7ed75d.pdf?index=true
    • http://libefowojimin.epizy.com/kukef.pdf
    • http://jafixomedimun.onlinewebshop.net/35473556600.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_off00010784.bin
f8e19dca5fc39961e29df3d71699b7c283b1d198cd195603e9132121ce03c880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 4936 bytes
font_01_sfnt_off0001182d.bin
b2ae1aa2db264339c28e7cd8468f6242e1e582319d4478fbb011d328b12986b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1182D 10940 bytes

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