Malicious PDF — malware analysis report

Static analysis result for SHA-256 2332477a3f5d98ea…

MALICIOUS

PDF

72.8 KB Created: 2021-02-21 21:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 28f3b8787fe9e9caaf070e400bffffe8 SHA-1: 5a7424be82bfbaea843b4b9b4db0c263079127f2 SHA-256: 2332477a3f5d98ea15ed46b8f8ec0e4521c78c4dec2c624630a73d9b6b3831a8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The sample was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it is a link farm and an MFA lure. The embedded URL points to a domain associated with phishing, suggesting the document's purpose is to trick users into a credential harvesting scheme. No scripts were extracted, but the presence of external URIs and the MFA lure heuristic strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://baarspo.ru/wix?keyword=ark+best+single+player+breeding+settings PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369505/normal_5ffc0ae227706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_60309f7539138.pdfIn PDF document text
    • http://chestlune.online/medical_check_up_form_for_work_permit7yk2y.pdfIn PDF document text
    • http://juzajikadig.22web.org/cambodia_arrival_visa_application_form.pdfIn PDF document text
    • http://kazoxizodasese.iblogger.org/burogudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_600d79da169db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dajolebewun.epizy.com/how_to_light_pilot_on_rheem_water_heater.pdfIn PDF document text
    • http://dozudaz.epizy.com/lefuvugepuzesirutipebu.pdfIn PDF document text
    • http://kosidigipetuvu.epizy.com/22327885413.pdfIn PDF document text
    • http://nepupiborama.rf.gd/elopement_budget_spreadsheet.pdfIn PDF document text
    • http://purowubiwebig.epizy.com/national_museum_bangkok_guided_tour.pdfIn PDF document text
    • http://jidowadosul.epizy.com/wakaxumegu.pdfIn PDF document text
    • http://xafafogaditeki.rf.gd/grammar_in_use_fourth_edition_answers.pdfIn PDF document text
    • http://wafogaz.rf.gd/vuzetopemuxe.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_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 5424 bytes
SHA-256: 560fd9b755a6e6474034114311a51ceec0e245ad397bdb4cdbd582b6a782d2d3
font_01_sfnt_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 10592 bytes
SHA-256: f58dd716d8cfd458001d1ee528b73ce0e19048b1db8ef93f73ef79bdd8413b4a

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