Malicious PDF — malware analysis report

Static analysis result for SHA-256 846dadc81465e383…

MALICIOUS

PDF

176.3 KB Created: 2021-03-14 12:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe25acd9f0aac3001a4252bafb0aae1c SHA-1: d275e18f3aaf7cf6d4cf5e5dfa3bcf4d0a0afb11 SHA-256: 846dadc81465e38350cc785d41506d4347d139ad87e0ef3e713a1320bfb55c0b
96 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. It contains an external URI pointing to a suspicious domain, vilenefex.ru, which is likely part of the attack chain. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=infective+endocarditis+guidelines+2017+esc
    • http://kuwufusef.22web.org/18655428900.pdf
    • https://static.s123-cdn-static.com/uploads/4495550/normal_5ffd98927ca1b.pdf
    • https://static.s123-cdn-static.com/uploads/4456686/normal_5ff464f2a1d35.pdf
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/netunavirojatowiga.pdf
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/netopopifu.pdf
    • https://cdn-cms.f-static.net/uploads/4485693/normal_604d846b1758a.pdf
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/145406.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/30b6f084-c356-4bc5-81ec-9c4a6532d1b2/69126371841.pdf
    • https://uploads.strikinglycdn.com/files/b673c5ba-7020-4730-8fe0-e8bd5ce6e53f/sisumo.pdf
    • http://joxupabazifo.rf.gd/how_to_play_cricket_darts_with_points.pdf
    • https://uploads.strikinglycdn.com/files/f5725527-884e-457b-831a-c1fc7c85df21/brother_mfc_495cw_drivers.pdf
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_401c4120e12d45b5982b96bf6a669a34.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b2526f69-4195-47a8-b160-d77efcd6668c/dupijivo.pdf
    • https://uploads.strikinglycdn.com/files/e10dd39d-4ddf-4a8a-a133-4877173f4ea5/how_do_i_fix_the_red_light_on_my_att_router.pdf
    • http://xufivutuxalug.rf.gd/21098063653.pdf
    • http://pukupufiribeja.epizy.com/wepos.pdf
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_b1bdfed2cec24f8983b7a3638eca9ae0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cf039fc8-dd0d-40dc-a59d-103f9d1b2fcd/kung_fu_panda_trailer_3_2008.pdf
    • https://uploads.strikinglycdn.com/files/a76172c8-34a2-404f-a2e2-b678e81fe9ac/yamaha_ypg_525_price.pdf
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_4e295bdabdb34fcc87ad542309018237.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e9150625-37b4-4759-a0a0-6f748be20090/72306338280.pdf
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_3ac9c6546ad14bf79da891e3f83a496d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/021adb7c-bf0c-4cd5-9e25-ef6861e57cb1/asus_p8z68-v_lx_bios_update.pdf
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_ad8d8c65e6f74fc193df310c6c0b9782.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002618e.bin
5808af14b0ee40ea7f47ddee1b7d0868d91b2f8df07b370b8a611b3ce3ee06fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2618E 5592 bytes
font_01_sfnt_off000274ba.bin
2d00dc66369a4338308708b8c96e8fdd6a19e06e0d79e4ec99c7961e2fda641e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x274BA 12356 bytes
font_02_sfnt_off00029db5.bin
ebaa9d42c58e3fd25c8264bcf4ef2319fee467c92cf53dcc1f377a20fc8d39b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x29DB5 16148 bytes

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