Malicious PDF — malware analysis report

Static analysis result for SHA-256 82372033872bfda4…

MALICIOUS

PDF

77.2 KB Created: 2021-03-20 22:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f8a18818ba04e192097c4a508584223 SHA-1: a2d379a3922658824e3b52d6b8807814b15025c3 SHA-256: 82372033872bfda4707182f1e5abf085bddf9723782066ede161c13e8d3c2559
104 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The presence of embedded URLs, including one pointing to 'dafemum.ru', suggests an attempt to redirect the user to a malicious site or download a secondary payload. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=sccm+software+install+log+location
    • https://cdn.sqhk.co/modajili/Sgehhgi/piercing_parlor_sacramento.pdf
    • https://cdn.sqhk.co/texafikogot/jeqhhh7/57792474357.pdf
    • https://cdn-cms.f-static.net/uploads/4469633/normal_603581477b0cb.pdf
    • https://cdn.sqhk.co/femolilepob/ibxglgh/8976644572.pdf
    • https://cdn.sqhk.co/nixafusoda/5J83Ecn/65593243937.pdf
    • https://static.s123-cdn-static.com/uploads/4465701/normal_600719a5a6fca.pdf
    • https://cdn.sqhk.co/bogovureg/jjhgfjh/zombie_offroad_safari_apk_obb.pdf
    • https://cdn-cms.f-static.net/uploads/4372384/normal_604776bb825e0.pdf
    • https://cdn-cms.f-static.net/uploads/4369764/normal_60273a372a78d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dizoran.epizy.com/45124629503.pdf
    • https://s3.amazonaws.com/remuv/38705896800.pdf
    • http://dopafedoxafedar.rf.gd/bubble_shooter_mod_apk_revdl.pdf
    • https://s3.amazonaws.com/vexosafugunu/10486070951.pdf
    • https://s3.amazonaws.com/bogeguva/ziwinoxazudasosasanoz.pdf
    • https://uploads.strikinglycdn.com/files/5b8c0bf5-5c2b-4d68-9826-7166e17a9106/hp_laserjet_p2035_change_ink.pdf
    • http://jevodowe.rf.gd/renunciation_of_executor_form_new_york_state.pdf
    • http://dupikupujetilu.rf.gd/19918172220.pdf
    • https://s3.amazonaws.com/baxegezivumi/venomancer_support_guide.pdf
    • https://s3.amazonaws.com/fajujiju/acca_march_2021_exam_fees.pdf
    • https://s3.amazonaws.com/gezetega/capitalism_video_game.pdf
    • https://s3.amazonaws.com/lazesej/97737091670.pdf
    • https://uploads.strikinglycdn.com/files/3d02eaed-43b6-4ca3-b576-b2f6420203d6/royal_navy_aircraft_controller_training.pdf
    • https://uploads.strikinglycdn.com/files/fb4daef9-157b-4a57-91bb-c9d9c7344f37/hpi_baja_5b_clear_body.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_off0000f081.bin
fdf93ba35856108dd2c5df1fe3d784d4fb8076a87a5a8b685698c139199361a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 5396 bytes
font_01_sfnt_off000102d9.bin
b76a1e8c0940cde7dedb95e9ac0bc972aace0ec2537c601f46db0a805ab3c386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 10604 bytes

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