Malicious PDF — malware analysis report

Static analysis result for SHA-256 719b549bf3ae59e1…

MALICIOUS

PDF

74.8 KB Created: 2021-02-11 02:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7bcfe8f8515dd831528561f88299d42c SHA-1: 4c09503bd20adb162d4b96204fca65944774ed2e SHA-256: 719b549bf3ae59e14e42ea6e366630bd0dbe453bcc53d031bed6655f4f9a4743
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a potential for malicious content delivery or redirection. The presence of numerous external links is a strong indicator of malicious intent, likely to direct users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=five+finger+death+punch+american+capitalist+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459180/normal_6012bbfd781bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454999/normal_6003852c769cc.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/500f98ad4e.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/jamezo.pdfIn PDF document text
    • https://taxupati.weebly.com/uploads/1/3/4/8/134891344/logowirir.pdfIn PDF document text
    • https://vumopofusub.weebly.com/uploads/1/3/0/8/130874587/7237526.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/nivamugenibiv_falomi_tumakagelufad.pdfIn PDF document text
    • http://premiumpornclips.com/beastmen_guide_total_war_warhammer_2gkpdi.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/jstiehd/xiwitan.pdfIn PDF document text
    • https://saxunada.weebly.com/uploads/1/3/4/8/134865385/xifolu_vogewofasavo.pdfIn PDF document text
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/fexidin-fifofikodita-xiladinazemulos-gixukuwedela.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410030/normal_5fe492dd17c03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/easy_trumpet_sheet_music_free_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/mugoxepagubedijivuf.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/kamef.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_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 5584 bytes
SHA-256: c63ad22b080e9d9c58e795740a43535a0d754ec8c97981aa9001e7144cd21c41
font_01_sfnt_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 11688 bytes
SHA-256: 813a109d54a42988ac7fe800eb7f89049e94945a253ff57a3545cc1dae833da2

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