Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6f5dfbba12942a…

MALICIOUS

PDF

110.4 KB Created: 2021-05-25 04:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 527cb57ef142a0ab3fb198c67762e7ca SHA-1: 1eb7d9a02c4769f866e80b57541cc64bd4c151e9 SHA-256: 5b6f5dfbba12942a34c931cadb819c8e84b8e1cc0f789c963ecfcaa50e0d1319
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to disposable hosting services and are likely part of a link farm designed to distribute malicious content. The 'SE_BRAND_CREDENTIAL_PHISH' heuristic indicates a brand impersonation lure, and the presence of a link to 'vilenefex.ru' with a 'utm_term' suggesting 'install custom recovery apk' points towards a phishing attempt for malicious applications. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/699ab9e94ee.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://vilenefex.ru/strik?utm_term=install+custom+recovery+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370996/normal_602987a377e08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5feb176fd802e.pdfIn PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/699ab9e94ee.pdfIn PDF document text
    • https://fipogelijemebu.weebly.com/uploads/1/3/1/3/131398193/d87cf.pdfIn PDF document text
    • https://lilufegat.weebly.com/uploads/1/3/5/9/135965666/0bf7aa3d06b.pdfIn PDF document text
    • https://fotovotujipibar.weebly.com/uploads/1/3/4/2/134267097/bfc9ed6430b27.pdfIn PDF document text
    • https://kanapajuzusuma.weebly.com/uploads/1/3/4/5/134589940/ratozo_puwadosab_kanafokur_gojirinafixowor.pdfIn PDF document text
    • https://gepufefodu.weebly.com/uploads/1/3/4/0/134013389/6818884.pdfIn PDF document text
    • https://kexezesokofu.weebly.com/uploads/1/3/3/9/133986719/70b6c460c2943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467560/normal_5ff911dac5431.pdfIn PDF document text
    • https://xanosetad.weebly.com/uploads/1/3/1/1/131163691/susinodemibomeb-tinudu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412388/normal_5fdfd6dc6224e.pdfIn PDF document text
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/5b1dfcb805598.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472198/normal_5fe25491717d4.pdfIn PDF document text
    • https://zubefexer.weebly.com/uploads/1/3/1/6/131606337/juxozer_fineb_simide_nunukoku.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
    • https://uploads.strikinglycdn.com/files/41b43fbe-ea80-4d45-824e-c2ee9a798afb/88710435041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2485a59-d205-45d9-9885-7b2731644b93/how_to_turn_on_zone_2_onkyo_tx-nr696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b06fd72-2ea4-49a2-9835-d3f296d2e628/best_food_chart_for_weight_gain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07d5a30-8c86-4b4b-b717-9ee071ed2076/97582518318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7472b559-99cf-4cae-8247-2f5c377e09d3/u_verse_remote_programming_s30.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_off00016400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16400 5076 bytes
SHA-256: 2b03b51a5b775e7a9607b92af69d7db07fac16824d81da834cc05ce28e5a362f
font_01_sfnt_off0001752f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1752F 11652 bytes
SHA-256: 5e33f8931045400e5aabecc67e88141a8c67da3e1f20f7fa4a829be94ac2b8cf
font_02_sfnt_off00019d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D08 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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