Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ec02805c1bd18d…

MALICIOUS

PDF

77.4 KB Created: 2021-07-13 00:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8393b95b50ea03dcf3580d5927439a4d SHA-1: d16e979f8de6694ee8580347bb8d12688d04eb13 SHA-256: d7ec02805c1bd18d754de6213707ce2581a96947f2b81e2febf4059c2d86b919
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a specific signature indicating it's a phishing trojan. An external URI pointing to 'synerhu.ru' was extracted, which is highly suspicious. Although no scripts were directly extracted, the PDF structure and the presence of an external URL suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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://synerhu.ru/square?utm_term=what+time+is+12+hours+ago PDF link annotation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e87cb2bbb307609754d1d0/1625849011034/signal_and_system_problems_with_solutions.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e83a183fca625151ca464b/1625831960638/vezagakagutib.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC3 17168 bytes
SHA-256: f3fedf5cf1fc71b6fec42e3debcf8bdf92d6560e7a7acfa37e49ce5b71ada9f3
font_01_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001114f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 10672 bytes
SHA-256: 010e59e1e866309553da440385e817dc2fae9746ebd270c6ae2784103b388843

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