Malicious PDF — malware analysis report

Static analysis result for SHA-256 2464a53eb29761cf…

MALICIOUS

PDF

73.3 KB Created: 2020-12-05 20:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6ef5835bbf763ec3d495c211aaba84b SHA-1: 1c68a4c8b60d3761213f59d80265b08d9c3fd45f SHA-256: 2464a53eb29761cf1b00a611714b31fff1b59536fec6951c81756d62cc525a90
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The presence of a malicious ML classification and ClamAV detection further supports its malicious nature. The embedded URL 'https://trafffe.ru/aws?utm_term=chitralekha+all+song' is a primary indicator of malicious intent, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=chitralekha+all+song
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5fc46336cff62.pdf
    • https://cdn-cms.f-static.net/uploads/4408879/normal_5f985b546dee7.pdf
    • https://lidenezat.weebly.com/uploads/1/3/4/3/134382714/gokoderirimovi-sazatigiwad-xoxamita-turorefilezom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc198bcc6d9645836271125/t/5fcb2b461ef6d1662feab53f/1607150407171/59963644179.pdf
    • https://static1.squarespace.com/static/5fc0e2b72bbd740658066ec4/t/5fc5bbbaf8cdb769c6aa1350/1606794173322/converting_recurring_decimals_to_fractions_worksheet_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/bdb2cb48-526c-48da-b08e-f06ca9965cd0/gbf_grid_guide.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf66b79d7936484086483f/1606379192004/2145121054.pdf
    • https://uploads.strikinglycdn.com/files/1ebb0e14-63b4-4755-962e-6409fd513263/zubixegekej.pdf
    • https://s3.amazonaws.com/muvojugejoxip/92405060121.pdf
    • https://uploads.strikinglycdn.com/files/93ff9c77-c834-45d4-a8ee-9afa05cc9399/kegixaxixelolapodagub.pdf
    • https://uploads.strikinglycdn.com/files/5583f1ea-64cd-4e0d-91a1-cf247089be07/eitzen_social_problems_ebook.pdf
    • https://s3.amazonaws.com/viboxikuz/parifagezubod.pdf
    • https://uploads.strikinglycdn.com/files/83875600-f240-4dc5-8647-72b613da90b0/38272648936.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_off0000e30e.bin
9e34bfd0dcb1068b58168cff6848d4392c4c6f787ce2d060263c3eea84fc3924
pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 4916 bytes
font_01_sfnt_off0000f3b6.bin
1fda3007659d05b7e05eae58825892896b95ccf173d25864013c826b20489357
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 10784 bytes