Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a55839566bd3b6b…

MALICIOUS

PDF

67.0 KB Created: 2021-02-28 15:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 410dc07a22b52b2a6922d78a2e312bde SHA-1: 3bcdc553a98946e5e5fb8481eb487748582764bf SHA-256: 9a55839566bd3b6be39902036e0d4d4fd0d50f51c10d7f7dd5d3f2143f110c91
124 Risk Score

Malware Insights

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

This PDF document contains multiple embedded URLs, with one specifically pointing to a 'distributed systems engineer job description' lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, and ClamAV detection as Pdf.Phishing.Trojan suggests a malicious phishing intent. The ML classifier also flagged the PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8307

Heuristics 4

  • 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 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
  • 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=distributed+systems+engineer+job+description PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5fe9b7813a680.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/7254554.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/VhjhdDE/samuwage.pdfIn PDF document text
    • https://vuterezupip.weebly.com/uploads/1/3/1/3/131380942/2172751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461485/normal_5ff2ff4099016.pdfIn PDF document text
    • https://cdn.sqhk.co/zogaxokeno/ggDWUgp/juegos_de_crafting_and_building_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/jcifJhg/47646057885.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368471/normal_5fc5b63699e9b.pdfIn PDF document text
    • http://imedo.ru/wall_street_journal_student_subscription_1_yeariwnw9.pdfIn PDF document text
    • https://baneboveboxov.weebly.com/uploads/1/3/0/7/130775782/zoraxuwoluvage-vilaxepudaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_600b7140444c2.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/mjiwjf4/66156506949.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buvumitibeve.rf.gd/mavakogukapupa.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/vunubisuguzoleziviwimi.pdfIn PDF document text
    • http://xelidamos.epizy.com/adalla_majaka_telugu_movie_songs.pdfIn PDF document text
    • http://muwiliwus.epizy.com/wordly_wise_book_7_lesson_15.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 5468 bytes
SHA-256: 901b0452661eef3d5459e6945bd54af7ca534a1f542e65e8638731807aebb002