Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfab0cf39103016a…

MALICIOUS

PDF

80.8 KB Created: 2021-02-02 23:39:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5f4c886c9fe2d014dc87789d964c49a4 SHA-1: 78a8b67e2eb0ba4d9dc94226a4d2ae7a8580259a SHA-256: cfab0cf39103016a0185574f3e054458f653d88574e5284732827a83957389fe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as an external URI pointing to 'https://jacksth.ru/123?utm_term=south+wilton+vet'. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it with high confidence, suggesting a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/123?utm_term=south+wilton+vet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409255/normal_600d5b3b81916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450034/normal_5fe4d3e0cbb0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470552/normal_601047113179c.pdfIn PDF document text
    • http://tisigetid.iblogger.org/tafowigeloderaxoxepoxaf.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/R061ENk/ball_into_washing_machine.pdfIn PDF document text
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/a6b9b68d99ac10d.pdfIn PDF document text
    • https://gedofulijul.weebly.com/uploads/1/3/0/7/130775434/jobefuxad-sajumike-linado-soguvubitat.pdfIn PDF document text
    • http://zirirukefup.22web.org/2233096571.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumepamef.rf.gd/vapekewizin.pdfIn PDF document text
    • http://tokafibalo.epizy.com/todasiwodakipofexemol.pdfIn PDF document text
    • http://nagivozuzosawax.rf.gd/centrify_express_ubuntu.pdfIn PDF document text
    • http://zimeketoxera.epizy.com/79320427331.pdfIn PDF document text
    • http://rupegofiminatef.epizy.com/3677540614.pdfIn PDF document text
    • http://jatuxijor.epizy.com/kovanupex.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_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 2968 bytes
SHA-256: afcae459a23cd8fad60e71fa482ed795063b178ca7a96d5a337757ed3e51a98b
font_01_sfnt_off00010243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 4544 bytes
SHA-256: 185f13d79e34dc5f63a80b4646f47985733b5290e4c0c71962b279f3108d6d15
font_02_sfnt_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 10732 bytes
SHA-256: a25f6980bf5d91e186f0e05760c2a9bddc1c3f13334aa40191cc29d06e5299eb

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