Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a79e0744690f3df…

MALICIOUS

PDF

69.1 KB Created: 2020-12-24 09:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d0c7d9b7430b0f16bc45519d897263ce SHA-1: 51e9b31acc3b1e0d1c97c342a1baf3551c4864e0 SHA-256: 1a79e0744690f3dffe8581f42c37acf318e8217cc4ef769fb25ba0d037a736ef
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URL pointing to 'trafftec.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'Simple music player instructions', aligning with a social engineering tactic to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=simple+music+player+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491173/normal_5fc37a320c07f.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/HkJhdgd/marvel_strike_force_squad_rpg.pdfIn PDF document text
    • https://cdn.sqhk.co/bifugudawesu/ShhQcpG/diamond_shop_ff_murah.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzewekafan/cphc2hh/lajulab.pdfIn PDF document text
    • https://cdn.sqhk.co/gisanewat/ijiijgi/auctionzip_calendar_mo.pdfIn PDF document text
    • https://cdn.sqhk.co/bakavaxa/gih2rhi/ice_cream_truck_for_sale_michigan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_5fa22272bd6f8.pdfIn PDF document text
    • https://cdn.sqhk.co/nafumozuwe/idgihdM/gefajudari.pdfIn PDF document text
    • https://tipuzinugex.weebly.com/uploads/1/3/2/6/132682040/459807c1e705.pdfIn PDF document text
    • https://riwobasafogad.weebly.com/uploads/1/3/3/9/133999818/8665622.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/dXiia5k/21522704539.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae53488-7f17-4b92-82c6-fd45f83bc23d/netufebizavefogumikupob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a340df2-1a95-444d-955d-0d03ffe7abfa/lipetitomufowipaxeluvol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3f8bdc-381f-4219-8112-0b43e4db32db/zudinojunek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef3dac2-d95f-4e6c-8cd8-04b899252207/62843240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6261a3-52ee-43fb-a553-ebaa0e82acff/teacher_application_lesson_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c49f294-b076-4832-bd3c-872c63acbf0b/10359249942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c7687a-d55f-4d02-845d-4fbe76dde94c/young_persons_guide_to_the_orchestra_imslp.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_off0000ce7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7A 5284 bytes
SHA-256: 5763e2dc4c17dbd6ac50372e653727d0495efcb4dceb9522cad22c4c15c85904
font_01_sfnt_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 11468 bytes
SHA-256: 57ed2464cbbe448b797fbfe1aef50d7023da19096f230133c64af1d492e0b1fd

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