Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7e59316e0a993b…

MALICIOUS

PDF

73.2 KB Created: 2021-01-03 15:54:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 290402832a46cd48311f1d422f8e8b2f SHA-1: ee83c1c98326f2b568363cde0e6a89f005f3bdf6 SHA-256: af7e59316e0a993b7aa1e281fe3d6ad7e0209baae13b586fc29473b725141a87
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafffi.ru/123?utm_term=blueberry+upside+down+cake+with+yellow+cake+mix PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462046/normal_5fcc6a9637ac4.pdfIn PDF document text
    • https://wuwenivavubujer.weebly.com/uploads/1/3/1/4/131437756/texonatizovoxi-gizapufunepimup.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/e1hylhh/58046308605.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dixaleko/westbrook_middle_school_nj.pdfIn PDF document text
    • https://s3.amazonaws.com/vopadofugon/pipivoze.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/34003565715.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/xovogozudowe.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/antiseptic_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/37046728421.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/mozobekurenegidikavizele.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/17064942705.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_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 5828 bytes
SHA-256: a530159b249e6a23c92f7b4c14e7a06241deb4659c2438c4c711dedafe544aef
font_01_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 10428 bytes
SHA-256: 2ec8d64ddd4469ca0668d82b059d81edc7a4e4b68365117ce203243f3b0e71c2