Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9124b755dbe42d…

MALICIOUS

PDF

77.9 KB Created: 2021-03-15 10:20:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b433749f7677e7ab8514d344602b3419 SHA-1: 7d98074f4bf5054f13900dd6373647a68922480f SHA-256: bd9124b755dbe42d64aa9bb5e8818e4e33906aba78ecd8f51d9cf26109efdd5b
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'ponafet.ru', which is suspicious and likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'study guide accounting answers', aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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/wix?keyword=study+guide+7+accounting+answers+part+3
    • https://cdn-cms.f-static.net/uploads/4375699/normal_603aa3278245a.pdf
    • http://chisto-chisto52.ru/samsung_phone_answers_on_speakerk8gjw.pdf
    • http://circulshtangcalip.website/detobebasexebodezazikawankr0h.pdf
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5fd67c2d10eb7.pdf
    • http://limelusefi.iblogger.org/voet_biochemistry_free.pdf
    • http://tigatixe.iblogger.org/mafabokutepuxe.pdf
    • http://kudretbozaci.com/520887038991nuwb.pdf
    • http://straponartist.com/how_to_renew_your_drivers_license_with_covid0hi3f.pdf
    • https://cdn-cms.f-static.net/uploads/4500440/normal_604692fd8ed15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://viwuleraxukopiz.epizy.com/gift_voucher_massage_template.pdf
    • https://uploads.strikinglycdn.com/files/c60e4efd-6ee2-41bc-995c-9e36d7a5c763/vizio_sound_bar_subwoofer_not_connecting.pdf
    • http://suvoxezol.rf.gd/chrome_extension_ublock.pdf
    • https://uploads.strikinglycdn.com/files/5d4f8ce9-8586-43d4-ae1b-6f36aa7f4ccb/19203099719.pdf
    • https://uploads.strikinglycdn.com/files/1f0557a3-205e-454d-8e1e-e3fcf61574d3/oracle_sql_combine_columns_into_one_string.pdf
    • https://uploads.strikinglycdn.com/files/73484777-6351-482f-8776-2efefffba61b/wall_street_journal_index.pdf
    • http://wuvasof.epizy.com/51527266933.pdf
    • https://uploads.strikinglycdn.com/files/6ca1d73a-d459-4c60-aa55-983d1c6af82e/tizuse.pdf
    • https://uploads.strikinglycdn.com/files/e83b0213-4c16-4fac-b81e-247c5ffc9e46/fizedunatijipuwipijivi.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_off0000ebdc.bin
e86959a346df01ce199fbb381678b7a97ba75359b382dfcee20a2f89b15f6655
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 5748 bytes
font_01_sfnt_off0000ffa0.bin
c6fe119b135df36b7272c137b8c768bbad4e3713499f82fece7bd4d2e6b1707e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 12944 bytes