Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c5ac32e54a40da…

MALICIOUS

PDF

76.6 KB Created: 2021-06-01 01:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ea9d2b9b1906056fd4d9886819d36144 SHA-1: b138a836ab80dd25789a55377dcf8ca36610fde0 SHA-256: b2c5ac32e54a40da5ac7092b9b3f2a16dabb221a22bf9a8fa77d0ee67dbdc385
186 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including brand-impersonation credential phishing and ML classification, indicating malicious intent. It contains numerous embedded URLs, with a critical finding pointing to a phishing lure impersonating Instagram and redirecting to a Weebly subdomain. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/lebomozozasubezikol.pdf.
  • 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://krisoc.ru/pbw?utm_term=msp+usernames+youtube PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418401/normal_60469285498b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371261/normal_5fee1666b345e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369499/normal_5ff94a747c3ed.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/lebomozozasubezikol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_60570761b42d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468550/normal_6052f790e4a32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374369/normal_5fdfc1d8a34d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444371/normal_6036c1e497f40.pdfIn PDF document text
    • https://noribiri.weebly.com/uploads/1/3/5/3/135347041/zevizezepanuwefukuf.pdfIn PDF document text
    • https://namoturobiro.weebly.com/uploads/1/3/0/7/130739164/8816572.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kokoxudalux.pbworks.com/f/karalis.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/working_principle_of_submersible_pump.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144431397/84215452536.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/w/file/fetch/144431763/8225194538.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144428826/which_is_better_dassault_rafale_or_eurofighter.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144414921/91451976792.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/can_i_get_more_emojis_for_android.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144429135/zanussi_lindo_300_tumble_dryer_not_working.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/w/file/fetch/144418581/what_can_i_say_to_my_niece_on_her_birthday.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/vuvinu.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/aaron_berkowitz_clinical_pathophysiology_made_ridiculously_simple.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/ai_football_ggo_season_2_episode_1.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_off0000e2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 5012 bytes
SHA-256: 96202b42fe3873301a758586a7a80a0011b94fff3b10ec46ff7af9e8cc6bb858
font_01_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 10188 bytes
SHA-256: 586eed268fc84de0030ae78e82278331a894df820b2fac57699982e64f2cd375
font_02_sfnt_off000116d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361