Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5b90c6755e8314…

MALICIOUS

PDF

59.9 KB Created: 2021-02-25 04:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 37c88fb46ee08efc29d6341b2b47c0a8 SHA-1: 449b3cff58cabdc388b75b50e3c01af879cdfa33 SHA-256: 9f5b90c6755e831404c20d7fda48d41879beca0d6f6d77f8fb17466b957bda6d
124 Risk Score

Malware Insights

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

The sample was identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to external sites, with one notable URL being https://leonvi.ru/award?keyword=cobra+29+lx+eu+for+sale. The PDF structure and the presence of external links suggest a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9734

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://leonvi.ru/award?keyword=cobra+29+lx+eu+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426413/normal_6024b6b051624.pdfIn PDF document text
    • http://bestita.space/transmission_line_theory_basicsc8n91.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/iahgmjd/82456473338.pdfIn PDF document text
    • http://jetanevuv.iblogger.org/co_marketing_agreement_template.pdfIn PDF document text
    • http://drovazvenigorod.ru/9548438275075l4a.pdfIn PDF document text
    • http://creditreportusa.info/39853749007q9eku.pdfIn PDF document text
    • http://pop-marketplace.ru/robinobokemuwivegoficem2p.pdfIn PDF document text
    • http://zemegazi.22web.org/aap_infant_feeding_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_5ff4d3361c0cc.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/lone_wolf_saga_mod_apk_money4rxh1.pdfIn PDF document text
    • http://dkmz2.club/jupemolodesolixulidet6j7rt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memapekoge.epizy.com/wokatuxifetobewivimur.pdfIn PDF document text
    • http://sijisizaf.rf.gd/zolapijeduvowemifuvorok.pdfIn PDF document text
    • http://garulolit.rf.gd/free_club_flyer_template.pdfIn PDF document text
    • http://sonedef.epizy.com/lukimebasebugefudefu.pdfIn PDF document text
    • http://gugefojekasarul.epizy.com/ajogbajesu_twins_songs.pdfIn PDF document text
    • http://fiteromuroxunu.epizy.com/phonetic_alphabet_police_officer.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_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 5164 bytes
SHA-256: a38a3afc9eb68108361b3986943268ea11b7e8c0030bca155918b9433ee805ce