Malicious PDF — malware analysis report

Static analysis result for SHA-256 81300be9708b3db3…

MALICIOUS

PDF

36.0 KB Created: 2020-03-12 03:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d8cf9490b4641c5bbc7d9ab8ccebfceb SHA-1: 340443c8414a9d74692e98af053e2cd16d326a22 SHA-256: 81300be9708b3db3d9e57cd2b274b2ee792cca5d06bd6b3e64772711f1d23e17
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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body text is largely unreadable due to encoding issues, but the presence of numerous external links suggests a link farm or redirection scheme, likely intended to lead users to malicious sites or distribute further malware. No scripts were extracted from this sample.

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://codegaffer.com/uploads/1/3/0/5/130551211/130551211.html#the+absolutely+true+diary+of+a+part-time+indian+study+guide+pdf
    • http://myremio.com/uploads/1/3/0/7/130738740/xajexituwexis-binolewaj-miwiratuponopiv-rujixakovebi.pdf
    • http://lifeindustries.org/uploads/1/3/0/7/130776049/ce957e.pdf
    • http://lakarnevalistas.com/uploads/1/3/0/7/130740550/99aa206.pdf
    • http://cdroadservice.com/uploads/1/3/0/8/130874304/zodegolipif.pdf
    • http://habitatmodern.net/uploads/1/3/0/5/130551562/momun-lexusegijexaf.pdf
    • http://www.mkequipements.ca/uploads/1/3/0/7/130776122/cc0958d47b148.pdf
    • http://www.savejacksmountain.org/uploads/1/3/0/9/130969645/8808511.pdf
    • http://blackwallcompany.com/uploads/1/3/0/7/130776141/04d08f3354.pdf
    • http://darkskyislands.net/uploads/1/3/0/6/130621511/mexutotabogid.pdf
    • http://cagedchicken.com/uploads/1/3/0/2/130289741/18e222e52a49f.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_off00006557.bin
73fbe09e5fb776aba739eadac9c564e800f0e9e76dd3952af1b2fcd9703c25f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6557 7452 bytes

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