Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a3c94a659e47b9…

MALICIOUS

PDF

86.2 KB Created: 2021-05-29 04:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d13408aa3419c827590de89dfb67054 SHA-1: 921280392e53d7be95ac7fea543c9a5a311d64d0 SHA-256: c8a3c94a659e47b93092851e03bc0efddbed0608cb3cde7945d83c097a8c5f18
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely as part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'dls file' and 'wkhtmltopdf', suggesting a lure to disguise the malicious nature of the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=how+to+set+dls+file
    • https://static.s123-cdn-static.com/uploads/4481162/normal_5fe4e4fa834db.pdf
    • https://static.s123-cdn-static.com/uploads/4444875/normal_5ff849bca8976.pdf
    • https://cdn-cms.f-static.net/uploads/4444100/normal_604acc80144ee.pdf
    • https://static.s123-cdn-static.com/uploads/4498842/normal_5fe3b8704d17c.pdf
    • https://cdn-cms.f-static.net/uploads/4490736/normal_602a4d13dc36f.pdf
    • https://cdn-cms.f-static.net/uploads/4426688/normal_60199e63d2070.pdf
    • https://cdn-cms.f-static.net/uploads/4389108/normal_606d1e2ee6e09.pdf
    • https://cdn-cms.f-static.net/uploads/4495392/normal_600a6a5038893.pdf
    • https://static.s123-cdn-static.com/uploads/4427529/normal_5fcd07b230766.pdf
    • https://cdn-cms.f-static.net/uploads/4393499/normal_60337fc22bca9.pdf
    • https://cdn-cms.f-static.net/uploads/4456699/normal_6022d4a3ba150.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b6cc0fea-a622-4c8b-bf88-87a4a0ea17d3/words_their_way_primary_spelling_inventory_excel_spreadsheet.pdf
    • https://uploads.strikinglycdn.com/files/bd84c62c-f6c5-487b-a5fb-610efd33ffda/snapper_battery_lawn_mower_reviews.pdf
    • https://uploads.strikinglycdn.com/files/1f5ac721-2a56-40a7-93ad-0d52afaa196e/zoom_h1_mic_stand.pdf
    • https://uploads.strikinglycdn.com/files/710e0f08-ff01-466a-aa3f-3cbb564520aa/38334089633.pdf
    • https://uploads.strikinglycdn.com/files/cc8ae757-2657-463d-81db-0f6524e0f55f/how_to_make_snake_using_python.pdf
    • https://uploads.strikinglycdn.com/files/fcb3ff07-438f-4394-b57e-caf28e83c70e/closer_patrick_marber_play.pdf
    • https://uploads.strikinglycdn.com/files/09a42e08-91b3-40b3-b3d1-96fa4301610d/los_100_verbos_mas_usados_en_ingles.pdf
    • https://uploads.strikinglycdn.com/files/d7fa72f8-fcbd-43cb-a8ba-69b9eb670438/68043993725.pdf
    • https://uploads.strikinglycdn.com/files/4923c529-22cf-44e3-abe3-8295b22e0b32/what_websites_give_u_free_robux.pdf
    • https://uploads.strikinglycdn.com/files/78e3e42d-6330-41a9-ad0f-dc8cc5605d32/how_to_use_insta_saver_on_iphone.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_off00010c5d.bin
d3a459d9b79ff069db65759744015b2ca0c2bfbf41a3142f22443be5f2e17f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 4648 bytes
font_01_sfnt_off00011c4e.bin
236c006f8ac502fe18ab0d85e79ad2d5ec9825334f2d94bc7ca77080c2049286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4E 1592 bytes
font_02_sfnt_off0001246d.bin
54482a149d8fbd5de5c0da1b1418b5de29c2e2f30eef2091e59a191e2542f186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 11360 bytes

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