Malicious PDF — malware analysis report

Static analysis result for SHA-256 78336bfd279713ec…

MALICIOUS

PDF

70.9 KB Created: 2021-02-16 18:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f091a5c47e08606aa327dc5bc378746d SHA-1: 4496f8ef592ae9c2a73ac29013d38d7009087308 SHA-256: 78336bfd279713ecff8d81794c052226a651a7ac606a2b2fcf41f7baab1477e9
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 pointing to disposable domains, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

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://baarspo.ru/wb?keyword=how%20to%20use%20hoover%20spinscrub%20heated%20cleaner PDF link annotation
    • https://cdn.sqhk.co/rumomezojeku/dY2Cbjd/etude_house_collagen_face_mask_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457302/normal_5feba9a18cda9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402252/normal_602b6cc990db4.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/b1fdbc16b71.pdfIn PDF document text
    • http://jazeforip.22web.org/10853574411.pdfIn PDF document text
    • http://wunowixumofe.22web.org/82981635373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_60150ad6abeeb.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/ihZXsja/vex_tournament_manager_raspberry_pi_wifi.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/gjhjiQD/pixijukalu.pdfIn PDF document text
    • https://cdn.sqhk.co/sazelusup/fJlGgeg/34585202121.pdfIn PDF document text
    • https://cdn.sqhk.co/gupetipek/Mjgdkhc/39881626866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5ffec1c82f47f.pdfIn PDF document text
    • http://mebelintera.ru/odisha_map_download_in_englishzv644.pdfIn PDF document text
    • http://copyrighthelp.info/65513508864ilhwk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaduxovogemuke.epizy.com/dutimezixovegebuvadezanuz.pdfIn PDF document text
    • http://nokakegobowu.epizy.com/finepemokonufoditaluna.pdfIn PDF document text
    • http://ganesuk.epizy.com/38485622012.pdfIn 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_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 5412 bytes
SHA-256: f174572cd884381ec513000563b48717e245156387424a43edbcb915f3ad777c
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 9940 bytes
SHA-256: dbefd1cc39ad21aff3e02bfd19d117358bd05e8e975e13cb857ad28ac2eb6ccd

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