Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5fdd6774f3e780…

MALICIOUS

PDF

68.8 KB Created: 2020-12-02 09:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ed11034397613ed31122525cff5703c5 SHA-1: 7b8b8a76ba8bc1faaf471b69b95574aeaa4842dd SHA-256: 7f5fdd6774f3e78033f33e9f68a73da3823a9022bd34c908de88547536e35d12
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 embedded URI pointing to 'https://traffnew.ru/123?utm_term=lorain+county+clerk+of+courts+probate', which is likely intended to redirect the user to a phishing site. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, suggesting it may be a generated document used as a lure.

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://traffnew.ru/123?utm_term=lorain+county+clerk+of+courts+probate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444657/normal_5fb2d6bf84a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5fa8950fa5187.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04ddd4d-a5b1-410e-bd4d-c71cddb30169/lututemubibexegusudemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ee0d06-1b5d-4784-8034-2c0af47dd536/zutudijovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef8487f-b869-4535-9a03-4e3652693a02/zoduvakutuzixasisugurun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c234477-3cca-428b-a23a-304f679aa2e7/red_hat_linux_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f57e49-acd0-4154-bbfe-385bafa08d98/druid_5e_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d252d508-9aa3-4a50-b03c-e483f5c00bfe/sanugowodowopasagipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d8a217-378f-465b-9045-c37215ea8717/gubager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f328efec-b2c5-4a73-aa30-39d3267d776f/why_buildings_stand_up_by_mario_salvadori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b492143f-8bda-4067-b811-8940c2ca5ad7/38983385745.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDC 5256 bytes
SHA-256: 37335798f3ebc58d59ef4e1437c62bf5c2a7ed21d7011727c6182ebc85d227b6
font_01_sfnt_off0000dedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDD 11220 bytes
SHA-256: fe08b167e4dc14cf00fc08dcdf50f80098335b990c1b424a37c5c64235035522