Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5732250ca03905…

MALICIOUS

PDF

88.0 KB Created: 2021-05-24 21:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39415312185d03e8285cf006662288cc SHA-1: 2d924b1821092f324b8c5b2693a7db21a389d6ec SHA-256: cf5732250ca039056932e848b14e38e5bd1dbd79a829429fd7a20162d0a549fd
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'jacksth.ru', which is likely used to host a malicious payload or phishing page. The document body, though heavily obfuscated, suggests a lure related to 'Ejercicios de logica matematica resueltos' (solved mathematical logic exercises).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=ejercicios+de+logica+matematica+resueltos
    • https://cdn-cms.f-static.net/uploads/4467274/normal_6050e99bddb57.pdf
    • https://cdn-cms.f-static.net/uploads/4450630/normal_60649924f2d9e.pdf
    • https://cdn-cms.f-static.net/uploads/4403683/normal_602426cb0a3cd.pdf
    • https://cdn-cms.f-static.net/uploads/4421768/normal_605797896db47.pdf
    • https://cdn-cms.f-static.net/uploads/4446759/normal_600f050193876.pdf
    • https://cdn-cms.f-static.net/uploads/4388833/normal_6065f254b6ccd.pdf
    • https://static.s123-cdn-static.com/uploads/4452173/normal_6004a2ce981ac.pdf
    • https://cdn-cms.f-static.net/uploads/4422137/normal_605efad840824.pdf
    • https://cdn-cms.f-static.net/uploads/4449187/normal_605f59a02236a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f8c14b13-f77a-491f-805f-58b3a32a7fb6/fodmap_liste_des_aliments_autoriss.pdf
    • https://s3.amazonaws.com/wizitifowubux/joyous_celebration_songs_list.pdf
    • https://uploads.strikinglycdn.com/files/9d6ad90a-5a56-4bd6-adb7-df21c338ac25/fumezufukoxe.pdf
    • https://uploads.strikinglycdn.com/files/88b2c196-186b-4a20-a9cf-8e3555d1545f/todd_lammle_ccna_200-301_volume_2.pdf
    • https://s3.amazonaws.com/kubedukowug/55398669040.pdf
    • https://s3.amazonaws.com/wizidimawag/service_catalog_template_ppt.pdf
    • https://s3.amazonaws.com/nonipesikiri/wivategozamogibolaki.pdf
    • https://s3.amazonaws.com/gekojulog/basic_and_clinical_pharmacology_15th_edition_download.pdf
    • https://s3.amazonaws.com/tojazudibumogab/menolekapalamoruzitow.pdf
    • https://uploads.strikinglycdn.com/files/bfa1861c-3125-409d-b912-8a46f57a7a0e/pogadodurujifaxisetikikap.pdf
    • https://uploads.strikinglycdn.com/files/e07deeac-c540-420a-a569-627e24c628ec/wuguge.pdf
    • https://s3.amazonaws.com/fifuto/jotofebegotefogizuwoz.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_off0001157f.bin
926145a03276764f52de462d6c144ea7a9c33154d3010da625e56e37ac7176d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 5292 bytes
font_01_sfnt_off0001276d.bin
5da9e3839b2f19b40cf29effecc8944bc7d7a41bf68192e29a56b844a665a288		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1276D 13396 bytes

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