Malicious PDF — malware analysis report

Static analysis result for SHA-256 72369a07d7c17955…

MALICIOUS

PDF

73.3 KB Created: 2021-02-16 20:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 74f85b17aac3861292d9f0ce6738a13a SHA-1: bf16bb9c51300516b8a2dd20348e0cc901deb3fb SHA-256: 72369a07d7c17955ce22fc9ebf2729eaf18f40a1e83c9980551ef4b1b14d3314
134 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' and a related link farm heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=agile+estimating+and+planning+poker PDF link annotation
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/1911978.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/sports_scores_live_updatesnh93j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451230/normal_5ff16ddd857b8.pdfIn PDF document text
    • http://wowezixuxaxu.22web.org/clat_2019_answer_key_consortium.pdfIn PDF document text
    • http://kekisire.22web.org/splash_screen_generator_android_online.pdfIn PDF document text
    • http://juzagunugix.iblogger.org/17466716017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494431/normal_5fdbaa056ef84.pdfIn PDF document text
    • https://sefujokugitexas.weebly.com/uploads/1/3/1/4/131408298/7964717.pdfIn PDF document text
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/1763241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485807/normal_60289eb9327b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467945/normal_5fef52c9b5e3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jijaxipejor.rf.gd/nesfit_cereal_integral_informao_nutricional.pdfIn PDF document text
    • http://sonazawokog.rf.gd/california_residential_lease_extension_agreement.pdfIn PDF document text
    • http://tuwobema.rf.gd/30871127572.pdfIn PDF document text
    • http://jikusawiv.rf.gd/50739365908.pdfIn PDF document text
    • http://nadefivetokilak.rf.gd/65672855784.pdfIn PDF document text
    • http://duvewukabiwetu.epizy.com/world_war_z_latest_update_2020.pdfIn PDF document text
    • http://koxowideza.epizy.com/36226864355.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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 5332 bytes
SHA-256: fcf29c58abe2be4f5a1f76cfe2c2742806242349e696fd376e56b5a73e1c1a1d
font_01_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 11072 bytes
SHA-256: 37469d513b24a6dacddc3c268815a87c54d300afdbf01240ab0516a32e8e4f5f

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