Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bdb295ad3f9219…

MALICIOUS

PDF

75.6 KB Created: 2021-03-22 17:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e20977171b297afc0ad1bae442e5cbf SHA-1: 47bfda6cc78f797551abc3615bbb75576157f7fa SHA-256: c9bdb295ad3f9219e5033d72a118e579a7e5cc04fbe5f55443d019d162bb256e
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 spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=gender+pay+gap+reporting+april+2019
    • https://zosibikatojufo.weebly.com/uploads/1/3/4/3/134382834/c2dc9be.pdf
    • https://cdn.sqhk.co/ranetixeba/iBrXljd/mozixop.pdf
    • http://lighterusb24.site/wendys_burger_nutrition_informationguvaz.pdf
    • http://tokio-2020.fun/doxel1ucfo.pdf
    • http://yachts-4-sale.com/pelilejexefipokavelokambd00.pdf
    • http://velixone.66ghz.com/8936876381.pdf
    • https://xazupegenam.weebly.com/uploads/1/3/2/6/132695472/romimudiparuf_nozemefapa.pdf
    • https://pulapafux.weebly.com/uploads/1/3/0/8/130874232/zewuxi.pdf
    • https://cdn.sqhk.co/dibirolinu/fbDhb6L/smartthings_login_not_working.pdf
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/feb944023dc6.pdf
    • https://dalibigexewekef.weebly.com/uploads/1/3/2/7/132712129/2335398.pdf
    • https://verakolor.weebly.com/uploads/1/3/1/3/131379730/07273ae.pdf
    • https://cdn.sqhk.co/guxudakakali/jfgevij/c64_emulator_download_apk.pdf
    • http://tradebot.space/sat_math_subject_test_khan_academynqotk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vogidide.epizy.com/meravuwenidigax.pdf
    • http://jejivosijej.rf.gd/36282945856.pdf
    • http://rozabakesolunu.rf.gd/sasomibuxanuwukoguvegew.pdf
    • http://gojaxuga.epizy.com/21581925875.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_off0000e82f.bin
0aedb3ea1b36860402687c4333638588b0ac622153ab60f2cbaace7593442c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 5564 bytes
font_01_sfnt_off0000fb3d.bin
f4b0404a783ba1163144319ae64498d125aaf420aee967a96249d2704804b92f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 11200 bytes

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