Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec016e69b5adf3e…

MALICIOUS

PDF

65.1 KB Created: 2020-11-13 05:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 883cd111a532fe68546787fc28e4b658 SHA-1: d27b91df7cf65b4284528a973ca0f71eefff848a SHA-256: 7ec016e69b5adf3eb3a788c11f6611f320ebe18de4b5ba5bba11db467c52e301
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or hosting further malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/123?utm_term=heat+transfer+lesson+plan+middle+school
    • https://vorarixumo.weebly.com/uploads/1/3/4/4/134490966/7375032.pdf
    • https://kepigepejabuji.weebly.com/uploads/1/3/4/3/134315220/314935.pdf
    • https://wugusuza.weebly.com/uploads/1/3/4/1/134131733/4510266.pdf
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/b98d2cda5427ef.pdf
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/2509795.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/winumigutam/52826238230.pdf
    • https://s3.amazonaws.com/tajimipojimo/punexitos.pdf
    • https://s3.amazonaws.com/rubidokezive/owner_operator_spreadsheet.pdf
    • https://s3.amazonaws.com/sukedil/e515dw_printer_manual.pdf
    • https://uploads.strikinglycdn.com/files/5af83514-e60a-4b36-89a1-7d9ac6794c2f/junaxeravozenapenile.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_off0000c365.bin
56d6a2093ad5729587a770cefe2519d036ae8db1eb9f13a8ff4771963e12834f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC365 5356 bytes
font_01_sfnt_off0000d56f.bin
a065df2184c256e8d1817360cfa02f12f63d72633f98750cf6431363b94cb725		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 10068 bytes

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