Malicious PDF — malware analysis report

Static analysis result for SHA-256 271c7fd41e17321c…

MALICIOUS

PDF

70.8 KB Created: 2021-03-20 00:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fe5cd2752026ea73897406d96eed748e SHA-1: 2376c7d4d457dee18bbc188962dcb78247665642 SHA-256: 271c7fd41e17321c2832f55c2c5d40c101d2d7475e96199b7bef1e3b66ce5175
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one prominent URL pointing to a suspicious domain associated with a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/123?utm_term=backing+track+canon+rock PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387565/normal_603a958d6fb53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_5fd85c70bd47f.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/jj3B7HL/latorobamebegorixitab.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/Lsghngf/nesezumaduzatawubanete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_601587b616efd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391954/normal_5fc966ecd08de.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/fOidU82/77699804514.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xizesewidepo.epizy.com/convert_adobe_file_to_word_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/76942005538.pdfIn PDF document text
    • http://zagawajali.epizy.com/whats_the_best_sleeping_position_for_period_cramps.pdfIn PDF document text
    • http://rivelik.epizy.com/57101461268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e0bc94-d1d0-4c28-be93-efd6805c9852/how_to_play_taboo_card_game.pdfIn PDF document text
    • http://zizizototumat.rf.gd/cms_report_online_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507ff2eb-2c29-4039-9c35-162e0a441eac/bose_sounddock_series_2_watts.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_e2c25380da7f4ad89d1cf9519aae7538.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goneduzum/computer_organization_and_design_4th_edition_solutions_chapter_5.pdfIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_92d8ccabf50247259601510e453e4e3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lebejos/arditex_na_latex_safety_data_sheet.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_ec98c760c1a5461fbba062c2413451f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/79028111219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8944425a-5724-4946-b31e-58d2d0a53daa/backpack_literature_6th_edition_free.pdfIn PDF document text
    • http://dafawubewetaja.epizy.com/how_to_replace_a_reciprocating_saw_blade.pdfIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_182db9058e7a4f378c2f16f69fbdbbcf.pdf?index=trueIn 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_off0000d23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23C 4868 bytes
SHA-256: b59530d93b6a25a4c5f018fe90104e51d32867d818244539786efe917b1c60f4
font_01_sfnt_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 13728 bytes
SHA-256: bd837056a48cc4ff89de4ed2fce4e17b7c41a9aa1dd792fb1ce1da3579f4fe95

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