Malicious PDF — malware analysis report

Static analysis result for SHA-256 25225971ab86f776…

MALICIOUS

PDF

45.1 KB Created: 2020-04-11 08:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 302841c83785c5717e52ad1843c9b94c SHA-1: 0ca33a1416a2d0e3eeee8aacdc52d0ba3c3bce22 SHA-256: 25225971ab86f7767101d8c60294decbeef940905f29eefdf5bb41b5120846a6
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links, many of which point to other PDF files hosted on similar domains. The document body text and embedded URLs suggest a lure for downloading movie songs, which is a common tactic to disguise malicious links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.dynamitebling.com/uploads/1/3/0/6/130604531/130604531.html#dj+telugu+movie+songs+download
    • http://emeraldstarclubstore.com/uploads/1/3/0/5/130542983/4080702.pdf
    • http://nutritionniste-nantes.fr/uploads/1/3/0/6/130639180/0a146c7b4aac81.pdf
    • http://winmillppm.net/uploads/1/3/0/4/130483856/c66265db6e4b7.pdf
    • http://oneminuteworkout.com/uploads/1/3/0/6/130621394/biware_rokomal_dokarabitavoru_povirukoziwezip.pdf
    • http://foryourcomfort.net/uploads/1/3/0/5/130550777/balupowuludedepofo.pdf
    • http://mygprf.org/uploads/1/3/1/3/131379999/suxizik.pdf
    • http://eva-uhhhh.com/uploads/1/3/0/4/130488734/6841045.pdf
    • http://sebobygg.com/uploads/1/3/0/8/130874496/6334015.pdf
    • http://dlselectricalltd.com/uploads/1/3/0/6/130604034/4909442.pdf
    • http://onlinewerkenmeerverdienen.nl/uploads/1/3/0/7/130740196/gurimigoza.pdf
    • http://infernopolishes.com/uploads/1/3/0/6/130621530/4ea55449f.pdf
    • http://thunderbirdelectricalservice.com/uploads/1/3/1/0/131070125/4138293.pdf
    • http://outsideincounseling.org/uploads/1/3/0/8/130814754/8574167.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_off000088a6.bin
f3051ef8fe865b36099d15451ddc02281fa3089d0af56c87bfdc5d19b60f4775		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A6 8276 bytes

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