Malicious PDF — malware analysis report

Static analysis result for SHA-256 2930c1af91171132…

MALICIOUS

PDF

92.3 KB Created: 2021-03-31 09:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2478d4aa6252279550bbc6a0f21bc3ff SHA-1: 7316bd2318558b97688fb78af7560bf381ab1ae3 SHA-256: 2930c1af911711327888c663582d39f5b3bfb5f33cf1802361fc7794465fb67e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains external URIs and is part of a link farm. The primary malicious URL, https://baarspo.ru/award?keyword=cardiovascular+system+physiology+mcqs+pdf, is likely used to redirect users to a phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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/award?keyword=cardiovascular+system+physiology+mcqs+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375344/normal_604cf0dfb2f87.pdfIn PDF document text
    • https://pijuvadugodawa.weebly.com/uploads/1/3/4/3/134307721/b3067b9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484169/normal_60545c9690fcf.pdfIn PDF document text
    • https://gazasajud.weebly.com/uploads/1/3/4/8/134879445/4606144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424981/normal_5fd17efcbf8fe.pdfIn PDF document text
    • https://ximabetewu.weebly.com/uploads/1/3/1/3/131384229/9c1ffb02b02c2bb.pdfIn PDF document text
    • http://niwimimotejus.iblogger.org/24324696096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_601f25ccbb5c7.pdfIn PDF document text
    • http://gukovukub.22web.org/bipedismo_en_la_evolucion_humana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/56741308-c2e6-4fcf-ae29-9cae1a5335fc/when_is_the_2020_sports_illustrated_swimsuit_issue_coming_out.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/pythagoras_right_angled_triangle_worksheet.pdfIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_a0eadde3601743d991f9b0c822c00259.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2fc050-40b0-4bfc-b514-09c9bae66e08/lldm_cantos_en_ingles.pdfIn PDF document text
    • https://73ea35ec-f0b0-4773-8bcb-d62b778c7de8.filesusr.com/ugd/a8e976_33533095092044cb92f539f10c76aeea.pdf?index=trueIn PDF document text
    • http://fugewad.rf.gd/cyberghost_5_crack_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852acd01-d06e-4749-b3f5-be68874c9f46/45670687227.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_f8c69ecdb750471f80eb47e1f11b183b.pdf?index=trueIn PDF document text
    • http://bimilenalo.rf.gd/patterns_of_enterprise_application_architecture_free_ebook.pdfIn PDF document text
    • http://tepokubomime.rf.gd/tafufisux.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/sport_mediaset_formazioni_ufficiali.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/address_error_on_credit_report.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/football_manager_handheld_2018_free.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/rakivexikinusu.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_off000129e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E3 5760 bytes
SHA-256: 86ec900bb8ae6e7816837318eb1776d02b5ba9718255d0532eae32a731da1ecb
font_01_sfnt_off00013d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D57 11412 bytes
SHA-256: 0793ac3d0952db81ed807780f42a2ce5f2b1707f0848a83bf3275cd6dbefce0a