Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ffeb0aee1fbda6…

MALICIOUS

PDF

72.6 KB Created: 2021-03-21 10:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f873a3d35c9ed728eb429c9ff2c6882d SHA-1: 4df80bde3bddd8ff6b0418b4f60f9e8ddb16d3f8 SHA-256: 32ffeb0aee1fbda6a3d15dd82f4ae43b0d518d5cd1f9a4e28b93ca6fada85484
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. Heuristics indicate the presence of external URIs and a ML classifier flagged the PDF as malicious. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to an audit report.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/award?keyword=risk+based+internal+audit+report+pdf
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/2005717.pdf
    • https://cdn-cms.f-static.net/uploads/4445737/normal_6027661f2f568.pdf
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fee61ec4ef01.pdf
    • http://wilugobosisur.22web.org/vosub.pdf
    • https://cdn-cms.f-static.net/uploads/4482863/normal_602eb4e7bcd71.pdf
    • https://rakumimow.weebly.com/uploads/1/3/5/9/135957304/7210523.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_a687ea3b37544f3797bdb1bebcb7d3bb.pdf?index=true
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_805fb20e4fd8415680b90b2536e8d36b.pdf?index=true
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_8222aea448a444aa87d63d12eb549ce0.pdf?index=true
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_46a3838dd0d24e1b99d4b0d748a1786c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/87c3b295-9cef-412b-8fd9-5529e3388703/59740295422.pdf
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_88bf3dcb02774729b0aea87e5d68ce5a.pdf?index=true
    • http://vejajideb.epizy.com/how_to_use_gamepad_cemu.pdf
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_2a85b9f5f59449768449bed484aca69d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/23717467-a7e0-4380-b25d-ad1b8dcc1b7b/honda_gcv160_pressure_washer_2600_psi_2.3_gpm.pdf
    • https://uploads.strikinglycdn.com/files/f811b29f-8180-4944-9944-351e658f244d/dolivukukidezigiluge.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_off0000e00e.bin
6a9c2b42dbc6c6a8c73958c0493e6e6bfe6585923637ed8af1585fc9083ce932
pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 5244 bytes
font_01_sfnt_off0000f1f2.bin
f17c9bd925d5a473d2b15548e43db13119c8536ebc80832a1406d8d1d52f0ff0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 10392 bytes