Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83d06cf2dea05e0…

MALICIOUS

PDF

115.9 KB Created: 2021-03-09 02:19:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cfdf31f358bbc7dc8d55a282d82bcd8 SHA-1: 23cbdd9527c2a5c879f1299e3a6ea4aef13d5c2e SHA-256: f83d06cf2dea05e0853f440401871416b0f2742d0faae7f3334a4ef5826b4cd6
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'dafemum.ru', which is likely used to host or redirect to a malicious payload or phishing page. The document body, though heavily obfuscated, suggests a lure related to an 'Asp.net mvc core tutorial pdf'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dafemum.ru/strik?utm_term=asp.net+mvc+core+tutorial+pdf
    • https://cdn.sqhk.co/nazabimon/KibDggc/36435696783.pdf
    • http://btsworld.org/7215534852r1xb2.pdf
    • http://bio-ita.fun/283149461874sjxv.pdf
    • http://sell-toclick.online/68014543828ifpsx.pdf
    • https://cdn.sqhk.co/fepogosu/aNxDpjc/ombre_nails_pink_and_white_gel.pdf
    • http://help-lnstagram-verifycopyrgiht.com/letter_sound_activity_worksheetsubwe7.pdf
    • http://tibisibafub.iblogger.org/kiviru.pdf
    • https://cdn.sqhk.co/fikubife/4Vhhjix/sojorejomupud.pdf
    • http://zeropium.com/kenitovitunuxiht1ys.pdf
    • https://cdn.sqhk.co/ripalufix/jhgQid8/hay_day_unlimited_coins_and_diamonds_game.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ac8ad2b0-be64-46fa-b5f2-b65f258e59e3/28227631716.pdf
    • https://uploads.strikinglycdn.com/files/4805ff62-d130-49f6-bcef-f50ca7ff0ef7/george_foreman_grill_medium_rare_burger.pdf
    • http://wotalagaxidi.rf.gd/what_is_the_best_breast_pump_on_the_market_today.pdf
    • http://jolagafo.rf.gd/83926692866.pdf
    • https://s3.amazonaws.com/babetafaperaxov/berger_load_data_6.5_prc.pdf
    • https://s3.amazonaws.com/dobikasukavu/what_is_curriculum_design_and_development.pdf
    • https://uploads.strikinglycdn.com/files/234679df-e8c7-4dd4-95a2-9c34b297308a/filewobokarop.pdf
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_2e83afc71e6543e0b09240af4f934358.pdf?index=true
    • http://titegerekarirov.rf.gd/vobebawugevutu.pdf
    • https://s3.amazonaws.com/wulotugadag/movie_review_template.pdf
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_52b3d4577e6c4320866938782e1d7863.pdf?index=true
    • http://rorulapuvutoj.epizy.com/patepopakenaso.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001508c.bin
b1dd12e991f1c8cc467454f7cde64869cfda1cee29bfaba698a60e0e0fcc1a9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1508C 5264 bytes
font_01_sfnt_off00016254.bin
1e7ecf19709c443715ab984a1fc35a88cad5b910c55d8d075759a054211efd7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16254 1820 bytes
font_02_sfnt_off00016b06.bin
2f00eadd06679330bbd332b6ca255bfe15c921317f9b659034a469db1416316d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B06 12208 bytes
font_03_sfnt_off000194d6.bin
c5d2a302c91aae058016d4b528c4bb609fd3fdf5f33da3db5ee60863eca49cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x194D6 16712 bytes
font_04_sfnt_off0001ab7a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB7A 4324 bytes
font_05_sfnt_off0001b92d.bin
0d9b6ab0354368cdfa5a4e52e4dfb250ede80cec4283e48fafec0a3c1c1d30df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B92D 1736 bytes

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