Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b026a914fa4046…

MALICIOUS

PDF

78.6 KB Created: 2021-04-14 22:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 99b3e8c41a96af37b4a5fc60b7e5cebb SHA-1: ea74bb55386efd76e63f7c4a1c5b345ea12ce363 SHA-256: 89b026a914fa404663e34d8782ce7bcb0ec97ce5f6757f7c951f042df5e7a73d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a prominent one pointing to 'xajibur.ru/strik'. Heuristics indicate this PDF is a link farm hosted on disposable domains, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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
  • 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://xajibur.ru/strik?utm_term=audio+technica+lp60x+needle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424996/normal_6034254474583.pdfIn PDF document text
    • http://electriccannoz.club/formal_letter_salutations_in_frencho5rbg.pdfIn PDF document text
    • https://cdn.sqhk.co/pojizurigos/bYigZhf/velovejivuxapogonuf.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/agghg2z/color_chart_hair_numbers.pdfIn PDF document text
    • http://xeeewq.xyz/the_tale_of_the_unknown_island_ds0mrf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452608/normal_5ff774fe140fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_601778f13a22e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_60586e502c359.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/jbgg2hf/92217345611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5fd1404d25716.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447107/normal_5fe385fd49f29.pdfIn PDF document text
    • http://comforfemj.fun/apc_back-_ups_es_700_manualbkfk3.pdfIn PDF document text
    • http://mushygushysayings.com/mupexatujutakewewavusazi02d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451930/normal_5fe512ec71655.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/gdu9Dif/febuvatopewugilet.pdfIn PDF document text
    • http://all-system7.xyz/how_do_i_type_spanish_accents_on_windows_10_laptop7jhuc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489587/normal_603a53f1e50b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424997/normal_605f9fa2c7d91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_600a25bc60557.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5ffd6edbc7830.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415526/normal_6006e434924a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_5ff668edd4b4d.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/gjjjcLj/43110889374.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417808/normal_5ff0b1ab8cd86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/caractersticas_del_modelo_atmico_de_arnold_sommerfeld.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/79305368390.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/12040684522.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_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 5240 bytes
SHA-256: cd19c5139025dcf65a0e09597fde26aeb64add6e0c520228c717c435c14c43f8
font_01_sfnt_off000107b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 11016 bytes
SHA-256: 35a68556d969ba37da1244e046bf81c94a3e68f9e6b72cae1ef35f3a26875c72