Malicious PDF — malware analysis report

Static analysis result for SHA-256 a981903f8f9828f5…

MALICIOUS

PDF

77.9 KB Created: 2021-01-22 23:35:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d7b688a91056410d689a304826dcce47 SHA-1: d25ecc428d34ab9c4724539ffa6ca5f4eea9dde9 SHA-256: a981903f8f9828f5d312d0d8d28dc3ee46ca7b69121b7e8a0c864cf1b9f80e04
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains an embedded URI pointing to 'https://trafffi.ru/aws?utm_term=bed+sheet+sets+clearance', which is likely the malicious destination. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=bed+sheet+sets+clearance PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5ff8dabf176dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5ff50e6ddc92f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_5fe9ab3dae154.pdfIn PDF document text
    • https://site-1176800.mozfiles.com/files/1176800/spreadsheet_in_sap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379613/normal_5fd1f4b154d15.pdfIn PDF document text
    • https://site-1177263.mozfiles.com/files/1177263/ice_hockey_skates_size_4.pdfIn PDF document text
    • https://site-1174906.mozfiles.com/files/1174906/download_game_3on3_freestyle_basketball_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/11WBPBd/very_loud_ringtones_free_download_for_iphone.pdfIn PDF document text
    • https://site-1175494.mozfiles.com/files/1175494/polurironu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5ff9892c6af57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405907/normal_5fcd6bead487f.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/jihgieg/joker_2019_sheet_music.pdfIn PDF document text
    • https://site-1173152.mozfiles.com/files/1173152/pejaxexejaxutiwamozekedun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/best_economical_manual_cars.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/metformina_efectos_secundarios.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/wikoku.pdfIn PDF document text
    • http://nomapalugaji.epizy.com/rivorujujigasematawi.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/al_quran_digital_pc.pdfIn PDF document text
    • http://vezexosewomex.epizy.com/zupinovi.pdfIn PDF document text
    • http://sosasofojatage.epizy.com/baldi_school_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/baker_encyclopedia_of_christian_apologetics.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_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 5076 bytes
SHA-256: a7512ea45da9887571c00197a9fcde7e2b7aeaf2e2ab79377464cebf82264124
font_01_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 11092 bytes
SHA-256: 98d2fa1a6342dcf7f561829ca72857e3bf5c0ccf8b4a6eb21d3ccc8e06412783

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