Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a7250263676c8f…

MALICIOUS

PDF

59.5 KB Created: 2020-11-14 06:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1338163400bb252f9cc69bac33026da9 SHA-1: d502a3c3799705211b88de212565b046aa21d38a SHA-256: 47a7250263676c8fe69411e163b56e600383019b7e606663acb07f9fa2e40eb5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these links, https://traffking.ru/strik?utm_term=my+rotten+redheaded+older+brother, is directly embedded in the document. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link farm designed to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/strik?utm_term=my+rotten+redheaded+older+brother
    • https://cdn-cms.f-static.net/uploads/4416938/normal_5f988a6b7e72b.pdf
    • https://cdn-cms.f-static.net/uploads/4426071/normal_5fa010117c137.pdf
    • https://kowedanu.weebly.com/uploads/1/3/4/6/134687265/pibepifu_wosud.pdf
    • https://diwapaxifok.weebly.com/uploads/1/3/4/4/134488462/4ca178e.pdf
    • https://pazodozonevaken.weebly.com/uploads/1/3/4/6/134606284/ridosizapil_jirofivipemop_lezuvavafari.pdf
    • https://xoretesani.weebly.com/uploads/1/3/4/3/134315313/sufuxotatoposos.pdf
    • https://cdn-cms.f-static.net/uploads/4493578/normal_5fa9ca801af4a.pdf
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5fa9b39d1beda.pdf
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5fa32da4eb453.pdf
    • https://cdn-cms.f-static.net/uploads/4453741/normal_5fa1293e0270d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tometubufimopim/38531016467.pdf
    • https://s3.amazonaws.com/sorogamat/algebra_age_word_problems_worksheet.pdf
    • https://s3.amazonaws.com/titugome/rofubabatokaz.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_off0000af30.bin
dd46a9380812086f69fde7468f84b36d41916c18a704b47b3f7dbb71f1a8ea9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF30 4980 bytes
font_01_sfnt_off0000c026.bin
2eadd697cd69813ad1fda8d0af5000d6e8c84214fd065ed2bf53704a6fa0dc5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC026 9548 bytes