Malicious PDF — malware analysis report

Static analysis result for SHA-256 53dfbcc3b08cdb10…

MALICIOUS

PDF

39.0 KB Created: 2020-04-10 12:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d5593ef0d36c8b92ba68762e48a0c2d SHA-1: 629b0bcf2d3faa1e506a3fcf017f50ee59d84751 SHA-256: 53dfbcc3b08cdb10d3fbcaa5d24d5b42712849a782b11d7afbde1e93b6fc70d2
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM'. The ML classifier also strongly indicated maliciousness. The document body, while heavily obfuscated, contains references to URLs that are likely part of a link farm designed to manipulate search engine results or redirect users to malicious content. The primary intent appears to be driving traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://woodandhook.com/uploads/1/3/1/3/131384018/131384018.html#lds.org+conferencia+general+2019+en+vivo
    • http://leeyas.com/uploads/1/3/1/4/131453780/835889.pdf
    • http://overpochsmostwanted.com/uploads/1/3/0/3/130323324/xukumerub-lutor.pdf
    • http://stallingselectricalservices.com/uploads/1/3/0/6/130639976/975218.pdf
    • http://productoneconsulting.com/uploads/1/3/0/5/130544494/2474622.pdf
    • http://hotmessbliss.com/uploads/1/3/1/3/131381693/gumagod.pdf
    • http://stitchmestudios.com/uploads/1/3/0/6/130604378/6dbb5f5bb9.pdf
    • http://collegeparkcleaner.com/uploads/1/3/1/4/131410747/peloterasugim.pdf
    • http://yemencoffeeboard.info/uploads/1/3/0/6/130621596/banevewi.pdf
    • http://ovlacmusic.com/uploads/1/3/1/4/131438231/watolofi.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_off00006c37.bin
fcac8d5d13961ce450e9418b4276a3b8008f34f405d341cec2982c6f3b71f4ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C37 9172 bytes

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