Malicious PDF — malware analysis report

Static analysis result for SHA-256 0735a82421e7c034…

MALICIOUS

PDF

67.1 KB Created: 2020-12-23 20:00:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0568ae5887339104bf0637c7d909285f SHA-1: d433705fd6791c05a736455a647f7ffaf6561024 SHA-256: 0735a82421e7c03474669b02a9d641d620e0ffdaa1c3b02416608122084c4cdb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate maliciousness, with the 'PDF_SEO_LINK_FARM' heuristic pointing to a large number of generated links. The document body mentions 'Ebay auction sniper software', suggesting a lure to attract users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/strik?utm_term=ebay+auction+sniper+software
    • https://ruwiderok.weebly.com/uploads/1/3/4/8/134891429/wemox-korad-tadepop.pdf
    • https://cdn.sqhk.co/netesatova/PdgjzgF/scary_shark_simulator_2020_shark_games.pdf
    • https://purapunebofo.weebly.com/uploads/1/3/4/8/134888030/tapuwawap.pdf
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/0836f2c35d91f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lorifawuvawot/87493702123.pdf
    • https://s3.amazonaws.com/mijedusovineti/wawezotenax.pdf
    • https://s3.amazonaws.com/gogonof/najefajosexu.pdf
    • https://s3.amazonaws.com/nilafafakem/hola_launcher_app.pdf
    • https://uploads.strikinglycdn.com/files/356faca3-c52f-4264-9d83-93122f2df887/xejusad.pdf
    • https://uploads.strikinglycdn.com/files/038d00c3-4a82-414e-9638-1b41b6af1f0e/rofatukoburewufefonope.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_off0000ca65.bin
d70ed4ca9503881deaf8f5c916fa2254d659987f4d129de5e56a5c7d1c465603		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA65 5268 bytes
font_01_sfnt_off0000dc7a.bin
6d9f4b47daf46fef0e7805fd292bcd4de78cf663298b059ab130a84504513254		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 10316 bytes

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