Malicious PDF — malware analysis report

Static analysis result for SHA-256 0429454bc7714604…

MALICIOUS

PDF

34.6 KB Created: 2020-04-05 11:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8ab9af66d3a5eb82d128edecef56fa5d SHA-1: ad22d9325100b18afc3c718054b63af49c788555 SHA-256: 0429454bc77146047c0ce68e1419ac1d147540fef9b4068235aa7dc20fdf8cd1
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, contains URLs that are also listed in the extracted IOCs. The ML classifier strongly indicated maliciousness. The primary attack pattern appears to be directing users to potentially malicious external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://holanomadas.com/uploads/1/3/1/4/131407067/131407067.html#como+calcular+o+perimetro+de+um+retangulo+a+partir+da+area
    • http://missoulaimports.com/uploads/1/3/0/9/130969212/mugamoke-niluvikamito-dexewi-buwigivoruvud.pdf
    • http://domoliseo.com/uploads/1/3/1/1/131163858/ae71bb3.pdf
    • http://dygevents.com/uploads/1/3/0/8/130874146/pizonejopa.pdf
    • http://www.lutonmusicexpo.com/uploads/1/3/1/1/131164418/rofilu.pdf
    • http://thekisstheory.com/uploads/1/3/0/6/130639107/lowos.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_off00005c76.bin
4448fbc90e7a7e6b63ac23353ffe77b6b099126cce1af16a1c7accf955808274		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C76 9348 bytes

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