Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91b149b8f784d7b…

MALICIOUS

PDF

193.0 KB Created: 2021-03-15 06:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 496bb2b51d4fb38dd93457b891e7106d SHA-1: 243ebc4e5c320e3ec3f226714c656d0d24fdae5e SHA-256: b91b149b8f784d7b394ba5cf6281f213c986f90a2ad46e804de0ad03310321ea
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on disposable domains. The ML classifier also strongly indicated maliciousness. The embedded URLs and the PDF's structure suggest an attempt to trick users into visiting potentially harmful sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=maharashtra+census+2020+pdf+in+marathi PDF link annotation
    • https://cdn.sqhk.co/kolusugego/zmjcegj/ap_world_history_exam_answers.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/how_to_pay_a_cell_phone_ticket_in_california.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/jbgi2zu/diversity_and_inclusion_statement_faculty.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/gigF6ic/super_mario_level_editor_games.pdfIn PDF document text
    • https://cdn.sqhk.co/somatugogo/thiEiiJ/sufi_and_bhakti_movement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_5fdacbe17dbef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499651/normal_5fd2a8eeda974.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/jhbcgiL/97699288238.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369901/normal_5fee78401acfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418987/normal_5ff8b10c86f30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_a1e63aac6853462caac9156c4a60647a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35d37d2-ba27-4d26-898e-7c48c973fa93/74707826975.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/vma_music_awards_2019_performances.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_5a4fff5004cf424fbcefa9e7956d4a72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83471500-a9ec-45c6-9515-8dffd5ac50bc/public_relations_contracts.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_7d603b339bb04a579ea54d8f8598c0e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fujadabez/gutomuzozawoziperupegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4081112f-46f6-4222-8a82-326f009da219/90179296739.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/cftc_form_40.pdfIn PDF document text
    • http://vegubom.atwebpages.com/kegolesiximo.pdfIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_881b1d76941a4b02ae7cbf7b9dfeb450.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_cabcfa6ddf9d41aea6a1ab5055a5e37a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/nyc_doe_academic_calendar_2018-_19.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00027b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27B63 5412 bytes
SHA-256: f3f57f1c606356e48b2f2c918a3bfe7f9ee1d129d9440c2da226c18622d3193d
font_01_sfnt_off00028d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D9F 14504 bytes
SHA-256: 779020a9a24debb748a87bfb915cb845f949f77cb89dfaec9708245a9547f9d2
font_02_sfnt_off0002bc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BC12 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e
font_03_sfnt_off0002d127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D127 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_04_sfnt_off0002df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DF28 6484 bytes
SHA-256: abac0f0c1abe42ec6ff71f84a91b4b2cdb38fd375cb5433e3a1bf8146941048d

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