Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ca228da957bca6…

MALICIOUS

PDF

78.7 KB Created: 2021-04-04 11:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 02fb236133280f839c82c42666698cf2 SHA-1: 66405da0e90ded4caf099b05417dc065d2ad7ccc SHA-256: 96ca228da957bca6c9d4ea77290f17f8a9c1ef038f5e0722175d52a3e4d2bb9f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially malicious sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=when+will+the+new+hunger+games+movie+come+out PDF link annotation
    • https://pudupisegatijuw.weebly.com/uploads/1/3/4/6/134670509/mopoluvilok_puvoxix_verupafuwoga.pdfIn PDF document text
    • http://jajuviramigawo.medianewsonline.com/4598266483.pdfIn PDF document text
    • http://virnet77.ru/52171788958jtclh.pdfIn PDF document text
    • http://garderob-podolsk.ru/8126846611996tr3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368741/normal_5ff925916d062.pdfIn PDF document text
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/vepekorati_nopazidufiv.pdfIn PDF document text
    • https://vijamosikafej.weebly.com/uploads/1/3/4/7/134772382/vanirosew.pdfIn PDF document text
    • https://vojubewerele.weebly.com/uploads/1/3/4/0/134013512/wanofop_zexalimufaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492915/normal_600c9e2a4b237.pdfIn PDF document text
    • https://mibudixu.weebly.com/uploads/1/3/4/4/134490534/wunusigixagowoj_kixudave_suwigitojibisu.pdfIn PDF document text
    • http://daating19.site/25431518200tr1ic.pdfIn PDF document text
    • http://mikrotikwizard.com/xelumusegexasulinugafz1vhh.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/toxodelaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_c5cb588bf1e44e3ba14ecb9e31a2488e.pdf?index=trueIn PDF document text
    • http://sijadogif.atwebpages.com/fopiwa.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_2ed2f1179c6e4464bde6cb13efd25387.pdf?index=trueIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_a62c37a341424d539ab9d36774bc93dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23519f42-7464-4ae5-b02b-0a5bb1307e80/what_are_the_7_domains_of_ppst.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/intervencin_en_crisis_trabajo_social.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_259454920ec34aaf9b222ba194213053.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5640de1e-2671-473e-a813-a50c1370c4e1/60697640996.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_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 5380 bytes
SHA-256: 8d694c7863b1b5506462d51c93857ad0285992f77206a13bb7090b5c576b7e51
font_01_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 11040 bytes
SHA-256: 600e1c271ef504dd013b7f1dac59e7dccc8331c689669fe95b9c96b37c8b236c