Malicious PDF — malware analysis report

Static analysis result for SHA-256 26882a392a95c474…

MALICIOUS

PDF

76.7 KB Created: 2021-04-17 12:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe9a8fcd9f403a076557346193e14dfa SHA-1: e6872df3472de9e82c0cc12b971f77650c49851c SHA-256: 26882a392a95c4745fee80e53475a5655a2bad070fb5d8b37d5a8e806f62abe5
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ponafet.ru/strik?utm_term=hp+officejet+pro+8620+ink+refill', appears to be a lure related to printer ink refills, which is a common phishing pretext. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=hp+officejet+pro+8620+ink+refill
    • http://nugawijuxuv.mywebcommunity.org/sotejox.pdf
    • http://niburufajanuto.sportsontheweb.net/authentic_assessment_articles.pdf
    • https://lupakekurusope.weebly.com/uploads/1/3/4/6/134652685/9826623.pdf
    • http://gomigapujasep.sportsontheweb.net/jazaniratiwozivitumetovib.pdf
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/sopepapigexa.pdf
    • https://legifufase.weebly.com/uploads/1/3/4/3/134349809/pisevolito_sosidemitakawob_sibutejem.pdf
    • http://tugokutuli.scienceontheweb.net/automatic_plant_irrigation_system_project.pdf
    • https://kenafowipadile.weebly.com/uploads/1/3/1/4/131437871/7708682.pdf
    • https://gebawifu.weebly.com/uploads/1/3/1/4/131483167/8845791.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lofunadex.myartsonline.com/god_and_philosophy_antony_flew.pdf
    • https://uploads.strikinglycdn.com/files/0ef0fc67-ddb1-499a-a7d4-07690fea3fdc/harry_potter_books_1-5_hardcover.pdf
    • https://uploads.strikinglycdn.com/files/41040448-589e-4c65-8aa7-370a5afbde35/subject_and_predicate_exercises_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/c9941916-e4d1-435c-9a5a-102d13336cf4/a_peoples_history_of_the_world_chapter_summaries.pdf
    • https://uploads.strikinglycdn.com/files/28670efb-efea-4c46-875d-43d944913550/lazon.pdf
    • https://uploads.strikinglycdn.com/files/e3ee245f-17f1-4cc4-8bf7-0cab69eb838b/narulilexufowuxinazex.pdf
    • https://uploads.strikinglycdn.com/files/e350f41e-3df8-403e-a41a-989ff646c0ef/tai_chi_24_form_step_by_step.pdf
    • https://uploads.strikinglycdn.com/files/a29c653e-2208-48c0-88d0-a2e660b7ca03/workshop_practice_series_29.pdf
    • https://uploads.strikinglycdn.com/files/31702323-8d56-452b-969e-e06c51aba25c/how_to_use_procreate_pocket_app.pdf
    • https://uploads.strikinglycdn.com/files/0c119479-e916-49af-ba14-366ad76cb12c/how_to_explain_feelings_to_therapist.pdf
    • https://uploads.strikinglycdn.com/files/3b670303-019b-446d-b7e4-5c08f8deb90c/valew.pdf
    • https://uploads.strikinglycdn.com/files/28c3b20f-eb08-4fbe-8d5b-49382e8b328f/41465831462.pdf
    • https://uploads.strikinglycdn.com/files/d9829d18-1cc1-4a2e-8452-fea81d6de6bb/social_contract_definition_ap_government.pdf
    • https://uploads.strikinglycdn.com/files/e3f66b26-5ad0-4ee2-aa05-2704c6d9defc/can_a_business_have_a_credit_score.pdf
    • https://uploads.strikinglycdn.com/files/20cb9522-837c-4e29-accb-91bbcf606763/power_xl_pressure_cooker_ribs_recipes.pdf
    • https://uploads.strikinglycdn.com/files/db260a88-97af-401d-862a-4d6d9663e7ae/playstation_gold_headset_user_manual.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_off0000eb95.bin
4ad710f63575009df0937ff6e801c5ed0428c28dbdf464aaad82c199cbf53b88
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 5344 bytes
font_01_sfnt_off0000fde9.bin
fe80dcfabc627971b125256705031c81e83b329d858401317ccfe76dc332637f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 11600 bytes