Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e91f654624ffbae…

MALICIOUS

PDF

74.4 KB Created: 2020-12-31 12:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea6bad5155a528b34a997bd9cf79bcc5 SHA-1: d4b1aeeea0e406c257633f2518db004b5b9f1a7d SHA-256: 5e91f654624ffbae0f7e33992681423b7f83b58831a19bb1352cf426395a4d2f
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary external URLs, 'https://traffking.ru/strik?utm_term=motorcycle+racing+videos', is directly associated with the lure of 'motorcycle racing videos'. The presence of embedded PDF link farms suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=motorcycle+racing+videos
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5fa26249574a5.pdf
    • https://vuguzunorofina.weebly.com/uploads/1/3/4/3/134322364/sikoxepugomeme.pdf
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5f9dbf31411ae.pdf
    • https://gituwelogasof.weebly.com/uploads/1/3/2/8/132814340/kotuted.pdf
    • https://cdn.sqhk.co/gadukupuwe/ggghNth/bose_color_link_reset.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muwemivumazulax/tosubu.pdf
    • https://uploads.strikinglycdn.com/files/3040fcdd-3136-49c4-8117-40a4b5fa98cc/vsdc_free_video_editor_windows_10_download.pdf
    • https://uploads.strikinglycdn.com/files/1b7c45af-f709-472d-8812-af42354f50cc/wotoxefup.pdf
    • https://uploads.strikinglycdn.com/files/f36b8359-b97a-43f0-a047-99198b610523/15261419655.pdf
    • https://s3.amazonaws.com/wumodukubaru/45046051702.pdf
    • https://uploads.strikinglycdn.com/files/7f4c66f8-bc31-43d2-92f2-50f4bb46a17c/vagipidivivitot.pdf
    • https://uploads.strikinglycdn.com/files/33b403a4-a6e8-4f52-9263-c388153f4bf0/65257105767.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_off0000e5b2.bin
d2bf53614e2069241d5a531976045e10b222f0e7d345df395fda293e66d069ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 5272 bytes
font_01_sfnt_off0000f7ca.bin
57457bab28722fa647ef890ff432e03b08310cd495061db7b5dc7f19689025d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 10928 bytes