Malicious PDF — malware analysis report

Static analysis result for SHA-256 9798cd942ccdc6ef…

MALICIOUS

PDF

85.3 KB Created: 2021-03-17 17:00:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 742793fd6b6783007454607b0271afd7 SHA-1: 1917ef860897764c62de5776cf1c18e5d5fbf459 SHA-256: 9798cd942ccdc6efda0ad153dd262e4c964debe391b98827cad4b2636391cfdf
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of an external URI pointing to 'resalured.ru/award' and the heuristic 'SE_URGENCY_LURE' suggest a phishing attempt, likely to trick the user into clicking the link. No scripts were extracted, but the PDF structure itself contains malicious elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://resalured.ru/award?keyword=caida+libre+filetype+pdf
    • https://cdn-cms.f-static.net/uploads/4427529/normal_6021d3375aaf8.pdf
    • https://cdn-cms.f-static.net/uploads/4417664/normal_5fe7f4ab6c77b.pdf
    • http://pressit.fun/nawefesukefexorok0wttk.pdf
    • http://vurupilinimini.iblogger.org/35408365719.pdf
    • https://cdn-cms.f-static.net/uploads/4472763/normal_600bc829a350e.pdf
    • https://static.s123-cdn-static.com/uploads/4471704/normal_600386025f746.pdf
    • http://nikecortez.net/best_android_platform_game_engineheosw.pdf
    • https://cdn-cms.f-static.net/uploads/4369769/normal_6038550a38616.pdf
    • http://d-youtube.com/romujidunotoroperew9pfk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8bcf26ff-0d75-4f3a-a3a6-af4546fca454/html_basic_tags_in_hindi.pdf
    • https://s3.amazonaws.com/gopuze/lekuxobesakanasuwuselepu.pdf
    • https://uploads.strikinglycdn.com/files/1a307056-bcaf-46c6-9913-5d2273a676f2/will_there_be_a_jacob_and_renesmee_book.pdf
    • https://uploads.strikinglycdn.com/files/eec4bf29-7426-4627-8c1b-daf5dacdbb84/hermosas_criaturas_saga.pdf
    • https://s3.amazonaws.com/jupevuxirapi/widur.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/jikedagoravapevefebewe.pdf
    • https://uploads.strikinglycdn.com/files/8d2c386c-452c-4ecb-9242-947d1afe6c5e/how_to_strengthen_your_gluteus_maximus_muscle.pdf
    • http://regisebe.epizy.com/accessing_akashic_records.pdf
    • https://s3.amazonaws.com/ponivotigegepub/sovejesax.pdf
    • https://uploads.strikinglycdn.com/files/16f43a90-48ad-4b58-85bf-c5a844b860f4/how_to_pair_skullcandy.pdf
    • https://uploads.strikinglycdn.com/files/0f031383-4e52-4e88-a2f6-d669355edbbc/call_me_by_your_name_free_online.pdf
    • https://uploads.strikinglycdn.com/files/e5234f42-c0d1-4cba-9c53-f86b8953dbd7/israel_kamakawiwoole_over_the_rainbow_ukulele_songs_chords.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff8d.bin
5d4f55eb26684db8a9415cbbc248b78023b9c43c8e2baab106b9ee21704773a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 4696 bytes
font_01_sfnt_off00010f9a.bin
0ffbf55a363cd84170eaadee82c91ef0e8cc1dd185f282d76a7a3a7d70f46ff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 12592 bytes
font_02_sfnt_off00013891.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13891 4324 bytes

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