Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85365d08e408b7b…

MALICIOUS

PDF

68.6 KB Created: 2020-12-03 14:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 855e9f8f61d855f73a05cbc1a767a2c5 SHA-1: bf463a4f204662ae13327b8909130c2338aebaea SHA-256: e85365d08e408b7b581a604b69495ae3aab2a0f52c36672994370e152713b181
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=expectations+theory+calculator PDF link annotation
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/1105018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_5fb6b8cad5755.pdfIn PDF document text
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/sijawenulom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_5fbbed88e31fc.pdfIn PDF document text
    • https://fefojaza.weebly.com/uploads/1/3/4/4/134480993/lupepatabev.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/zuputivojedasa-wigenes-vujasosobarugil-misek.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/vonutavekip/dewumufutoji.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/excel_sum_of_cells_in_different_sheets.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf504c3485235c86bcf706/1606373452946/59521869769.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/caller_id_hiding_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/38145014153.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_off0000cf83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF83 5148 bytes
SHA-256: 67eb4c476d6af8b13ee39f91841c6fefdd060e76eae47c2e558122f760ead950
font_01_sfnt_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 10744 bytes
SHA-256: e2a8df4fa5b6ba0d13b20cf94a2e3e2c8c2b56f6c8094704841b0b0dcb7795a1