Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5564f7858369f7c…

MALICIOUS

PDF

33.3 KB Created: 2020-05-25 01:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5d98a981b4d4a2cd874ca82bd4829de SHA-1: 1dd2ee4de72ced05f7872bb505dfdcf6f0520188 SHA-256: b5564f7858369f7c1f4d977f1c2feb7ed16d7af7433a1ba9ff1e8ac63755ba28
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to a network of suspicious domains, likely to host further malicious content or phishing pages. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 4

  • 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 http://vps19.pleasingfood.com/uploads/1/3/0/5/130543995/130543995.html#obsidian+islands+ac+odyssey
    • http://averytracebluegrass.com/uploads/1/3/0/7/130739505/xonewojasa.pdf
    • http://santexrealestate.com/uploads/1/3/0/7/130740256/jebovifososudi_pudewalumab_fopazo_vaxakilo.pdf
    • http://eptautoglass.com/uploads/1/3/0/6/130620926/4972888.pdf
    • http://martinezfencing.com/uploads/1/3/1/4/131412362/0fdb2797a6cd.pdf
    • http://xiuyuanchen.com/uploads/1/3/0/6/130620614/1187122.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005860.bin
b378eb990b2cf130bd2634e4f16379ec80721c7c6a054e6cf238fe6fe6f79bcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5860 10052 bytes

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