Malicious PDF — malware analysis report

Static analysis result for SHA-256 37459a0b539611de…

MALICIOUS

PDF

78.7 KB Created: 2021-06-09 15:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6079b31fc6f43dd6d566ae1b2ec5e223 SHA-1: 7458c0145937bfc776ae33255f51074485501c5b SHA-256: 37459a0b539611ded4ec5511815b8d3f139d9aaaf30ffce9e7d2bb1574706d6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata related to the URL and authoring application, reinforcing the link farm and potential redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/pbw?utm_term=1+night+in+paris+more+like+this
    • https://jefifekelu.weebly.com/uploads/1/3/4/7/134744422/8015440.pdf
    • https://nabutamu.weebly.com/uploads/1/3/4/5/134525390/a008a4cb9fd1e86.pdf
    • https://lapadodipelij.weebly.com/uploads/1/3/1/1/131164402/e27f772aaf61b37.pdf
    • https://cdn-cms.f-static.net/uploads/4495550/normal_5fda8e2f00193.pdf
    • https://xixinuwomisit.weebly.com/uploads/1/3/1/4/131437484/2382613.pdf
    • https://cdn-cms.f-static.net/uploads/4369781/normal_6031d6c054f89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ridelox.pbworks.com/w/file/fetch/144763383/tasugijoleris.pdf
    • http://givuvop.pbworks.com/f/55608777625.pdf
    • http://zufiwuz.pbworks.com/w/file/fetch/144615333/how_to_tell_someone_they_have_borderline_personality_disorder.pdf
    • http://tikomegeto.pbworks.com/w/file/fetch/144567306/how_do_i_transfer_contacts_from_lg_flip_phone_to_android.pdf
    • http://lexibitite.pbworks.com/w/file/fetch/144534822/job_performance_evaluation_form_sample.pdf
    • http://ximusutoj.pbworks.com/f/zovejizevima.pdf
    • http://jobojifitin.pbworks.com/f/gaduvupuralevolot.pdf
    • http://fesatisobif.pbworks.com/f/pokemon_go_ios_mod.pdf
    • http://jizakatum.pbworks.com/f/free_synonyms_and_antonyms_worksheets_4th_grade.pdf
    • http://wodupabizel.pbworks.com/w/file/fetch/144926652/stream_football_games.pdf
    • http://kegogaxevu.pbworks.com/f/hackney_parking_zones.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f692.bin
abe0a54170ec808917a6f1f504fa125aa35d10551820013ab8df6da8970e65b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF692 5252 bytes
font_01_sfnt_off00010849.bin
c0f57835cbdd376588c77bc0b9a06d38ad70b321deb277ab671c4fc093daa7e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 11076 bytes

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