Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff09ea8e85d74e9…

MALICIOUS

PDF

80.5 KB Created: 2021-02-28 04:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae1f56364758d12bedb860b46f86aa0c SHA-1: dd3be1c5c0618029ff8cda17a52c0b1f067a2970 SHA-256: cff09ea8e85d74e9c75d874985825ca2b708b9e7dbd3bb17daf1a7efd42db462
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a large number of external links. The primary attack pattern involves directing users to a link farm hosted on seumenha.ru, which likely serves as a distribution point for further malicious content or phishing attempts. The presence of numerous PDF links suggests an attempt to manipulate search engine results or distribute a variety of malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://seumenha.ru/strik?utm_term=ancient+greece+art+planning+ks2
    • https://cdn.sqhk.co/bedipidis/BYrjbid/color_picker_in_excel_2010.pdf
    • https://cdn.sqhk.co/sojetaji/yjffge7/6882571499.pdf
    • https://dexexufadojobiw.weebly.com/uploads/1/3/4/1/134109071/xekajaf.pdf
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/tipaw_fesufoja_xenegigoleku_ganekevatebut.pdf
    • https://cdn.sqhk.co/gonolesuzam/iadXM3G/maternal_movie_trailer.pdf
    • https://cdn.sqhk.co/rovujesox/cRNNkjb/guxobe.pdf
    • https://fikobovivinuzo.weebly.com/uploads/1/3/0/7/130739062/daredodemone-wanuv-talajabirat-bilozodod.pdf
    • https://lamekibig.weebly.com/uploads/1/3/4/6/134652122/4608158.pdf
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/gupunatoson.pdf
    • https://nozugaxuxanukuj.weebly.com/uploads/1/3/0/8/130813784/8433209.pdf
    • https://kogovuvukadag.weebly.com/uploads/1/3/2/6/132682039/bumedanusona.pdf
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/kejozotiteba.pdf
    • https://cdn.sqhk.co/wisewuguv/dhhhcMf/32231901381.pdf
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/861e89239.pdf
    • https://cdn.sqhk.co/bibolaned/hgidgfV/big_rig_truck_repair_rantoul_il.pdf
    • https://fupozivu.weebly.com/uploads/1/3/5/3/135316658/mafonijajatu.pdf
    • https://pogosarixuxa.weebly.com/uploads/1/3/0/7/130776079/218e7cf4e2e.pdf
    • https://tetuxexe.weebly.com/uploads/1/3/1/8/131871535/gorifebixesexoz_mosedixibe.pdf
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/9890060.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sejonigimanam.epizy.com/mikaromexarida.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_off0000fef3.bin
8328a6984a98b4e24d099f83debc193ef481074b891307509264b2d1cb694467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF3 5284 bytes
font_01_sfnt_off00011103.bin
8a0a1a6202bd79febe1d3ffe78031c965898a7fa98c2379d263c9340d02269a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 10460 bytes

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