Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc39eebbef32a284…

MALICIOUS

PDF

73.3 KB Created: 2021-06-07 10:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 06866685295771171198e7bb595246a6 SHA-1: 5726657f283d0ab3930c6ca4536a40863f9df19d SHA-256: dc39eebbef32a2849daa98b6f6c1bd811bf4a91f041fe7c9fb43c26ee4ecef0c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, including one pointing to 'synerhu.ru', which is likely part of a phishing or scam campaign. The presence of many links on disposable hosting suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/pbw?utm_term=php+basic+programs+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491169/normal_60045a6eb4876.pdfIn PDF document text
    • https://votopugukoz.weebly.com/uploads/1/3/5/3/135315446/6bb4dcd89f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_60218dc6ae3df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_604803777eee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_6010c5e197056.pdfIn PDF document text
    • https://wuwejinetuna.weebly.com/uploads/1/3/2/6/132681176/gugovumebor_buvukefuxinitin_wugadidajex_dabid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_603462e2cbc46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bolejagum.pbworks.com/w/file/fetch/144741459/taylor_swift_reputation_stadium_tour_google_drive.pdfIn PDF document text
    • http://vawijoj.pbworks.com/w/file/fetch/144625323/meter_to_kilometer_worksheet.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144419271/ligemutidavifasawozolirim.pdfIn PDF document text
    • http://zobifel.pbworks.com/f/990179120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6173b3c-de8f-4a75-83df-c8bed736b000/28253327591.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144525498/god_of_war_for_ppsspp_highly_compressed_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccfabb3d-3c2e-4567-8eac-333feb2b253f/55306809952.pdfIn PDF document text
    • http://niluputevi.pbworks.com/f/paper_plane_planet_unblocked.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/w/file/fetch/144451698/how_to_resize_a_photo_to_uk_passport_size.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/f/babemevabo.pdfIn PDF document text
    • http://gosavepifij.pbworks.com/f/65424284950.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/advantages_of_non_probability_sampling.pdfIn PDF document text
    • http://kukepofarit.pbworks.com/f/naruto_shippuden_ultimate_ninja_impact_ppsspp_download_500mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5434b470-96a9-4d7a-a2d1-40bf1afd58b6/black_and_decker_grass_hog_gh600_type_5_replacement_parts.pdfIn PDF document text
    • http://wisarazed.pbworks.com/w/file/fetch/144459468/16937376319.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/f/48749091741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f067f4c-9a79-4ccf-a118-219502f2388c/34563144038.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_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 5676 bytes
SHA-256: 93833cbeac6b2461503d90c6b3ee731f7fcb6d00f55d858b597c48047ef432cf
font_01_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 10344 bytes
SHA-256: f1388128fd2b300efa3ec58ac9032154f9f5f7e0fddb71e77a355c712e593eee