Malicious PDF — malware analysis report

Static analysis result for SHA-256 2160c6ca7f166d12…

MALICIOUS

PDF

187.9 KB Created: 2021-03-22 18:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1db2818596380857f58f8897d0c238b0 SHA-1: 61935d16dceb7e29e5ff731560157e1300cca06f SHA-256: 2160c6ca7f166d12697c2b7e5f1925e2e3ea870e989f7ebd511ba01d710224f0
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically for brand-impersonation credential phishing. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/6453230.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://zajinet.ru/strik?utm_term=michel+foucault+the+birth+of+biopolitics+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478137/normal_600a21d0cb75c.pdfIn PDF document text
    • http://bigpleasure.ru/is_a_convection_oven_better_than_a_regular_oven0vmu8.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/ighhgIS/sopuj.pdfIn PDF document text
    • https://cdn.sqhk.co/megilujij/hqkhaja/primal_legends_gift_code_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/mokabawimav/Fjihijb/jumusovuriv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450034/normal_5fc59a3c41b05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485156/normal_5feb3983e3b88.pdfIn PDF document text
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/6453230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_604e3d875f51a.pdfIn PDF document text
    • https://cdn.sqhk.co/goxejake/wtjdxhb/80660484953.pdfIn PDF document text
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/fd6f00d1a85.pdfIn PDF document text
    • https://zunejafeg.weebly.com/uploads/1/3/4/3/134382709/4246911.pdfIn PDF document text
    • http://rikopevadibix.iblogger.org/subupusukakekediposug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_60372190c299c.pdfIn PDF document text
    • https://cdn.sqhk.co/xudogafu/dPijxDj/begexitezuxajebe.pdfIn PDF document text
    • http://trikolor.site/747829666962elo6.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/magapeguwabe/stock_market_live_today_yahoo.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/border_light_apk_xda.pdfIn PDF document text
    • http://taperimogitunal.epizy.com/40560538744.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/33762739019.pdfIn PDF document text
    • http://rolodumom.epizy.com/alfonsina_y_el_mar_coro.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_off0002a2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A2E1 5500 bytes
SHA-256: 739d296bd81feb488c121776ab4dc073c2ecc37309607679c4d195d352ae1d26
font_01_sfnt_off0002b583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B583 14180 bytes
SHA-256: dcaf4a0fac48e66a73b8078b9c6d72edebef92c1710f0bf6282de29508008202

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