Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf5a92e0ce413ad…

MALICIOUS

PDF

77.4 KB Created: 2021-02-25 17:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 117451ef61951a9a813de231738d6ce4 SHA-1: 458162f0325d4f412f6c361e8236556f837ef775 SHA-256: aaf5a92e0ce413ade0b080af5c5f0f56dc1598ab0b2f0388aec5185fcdf23ceb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://seumenha.ru/strik?utm_term=diy+log+splitter+kit', appears to be a redirector with a search term, further supporting the link farm hypothesis. No scripts were extracted, but the PDF structure itself is designed to host and present these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://seumenha.ru/strik?utm_term=diy+log+splitter+kit PDF link annotation
    • https://cdn.sqhk.co/tezofugowura/iis32rt/mobile_legends_adventure_tier_list_october_2020.pdfIn PDF document text
    • https://notozovurex.weebly.com/uploads/1/3/2/8/132814393/1599130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_6029713299fbc.pdfIn PDF document text
    • http://espaceclient-cmb.com/contract_addendum_form_meaning22syd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370087/normal_600306567348e.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/xgfgfgj/71589706087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445534/normal_5fd05830b01a2.pdfIn PDF document text
    • https://vujilesozigo.weebly.com/uploads/1/3/4/0/134042384/b5e327056.pdfIn PDF document text
    • https://cdn.sqhk.co/lediname/ibhaXD3/hit_or_miss_lyrics_nfg.pdfIn PDF document text
    • http://hydra.moscow/pinata_hunter_3tiiiq.pdfIn PDF document text
    • https://xelusivixofon.weebly.com/uploads/1/3/5/9/135958974/bejodu.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/ggiagdf/gonapuximif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365639/normal_600119f759078.pdfIn PDF document text
    • https://cdn.sqhk.co/zowipitilo/fhahgyL/lurezibufogoloso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485689/normal_602987f6c4051.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_5fe0de0e7663e.pdfIn PDF document text
    • http://cparta.moscow/88038879941t7di5.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/jchb5Vc/nintendo_switch_online_offers.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/hgc1M9M/85671737005.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 4940 bytes
SHA-256: 02f538b7af0f3a4c123cfd2d6151cdf1e55f262f9e61aadb2f31c9ecd3a968f1
font_01_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 11056 bytes
SHA-256: 606ca3becaffee41b3fb2611c2d45d7f19ea36f59937efa5e06406d9e9d53664

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