Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd6997c3a2be803…

MALICIOUS

PDF

73.7 KB Created: 2021-03-01 23:21:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f63b386b5776e29f91a86402dc5c905d SHA-1: d765871814e705f592c219dbe2c25b25118eeeec SHA-256: 9cd6997c3a2be8035bb35116b296318925a852ac00834ec604a427a3aeb1e25e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

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://dugedepap.ru/strik?utm_term=curso+marketing+digital+e+ecommerce PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490364/normal_601c69e969008.pdfIn PDF document text
    • https://kagunalikabogow.weebly.com/uploads/1/3/5/3/135350350/puwezujenu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425908/normal_5fe49a9eb46d7.pdfIn PDF document text
    • http://begemotiks.fun/root_word_mitosis_meaninge2r8e.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/on_the_incarnation_st_athanasius_summary.pdfIn PDF document text
    • http://frankiearvelo.com/why_is_my_freezer_not_coolingm3eag.pdfIn PDF document text
    • https://ragadavifomo.weebly.com/uploads/1/3/5/3/135306528/fefazirigofadol-lutimizuri-woruze-bovamufe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475219/normal_60033bde113dd.pdfIn PDF document text
    • http://autoupgrade.website/leleputewoes04u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501791/normal_600cc0d8547cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470209/normal_6027bcbadb875.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460466/normal_6004b34974d47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_6033f3636f7fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zizene/formal_dress_hire_uk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 5228 bytes
SHA-256: 66893d414099225fbe4f15e93fb191d49949e56ff932538e4f586c6f9000e30d
font_01_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 10044 bytes
SHA-256: 93e1040bbaabd15a9e7e5515583ce1c9168da6d1fa6b6435ccd822dd23455e57
font_02_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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