Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af993a2612dd701…

MALICIOUS

PDF

36.0 KB Created: 2020-04-15 16:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 040b48af4479161a643b6fff185a6f8c SHA-1: 7846f4db5e490cd8709d2ff35e8637197dfaa707 SHA-256: 7af993a2612dd7013021aee064126b597d7d6b2d4fd0e49517e446dacd9afc71
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. These links likely lead to malicious websites or are part of an SEO spam campaign to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://wyneguys.com/uploads/1/3/1/4/131437376/131437376.html#chander+pahar+full+movie++utorrent
    • http://bestratemedia.net/uploads/1/3/1/4/131437116/tigadigiku-tebale-vadidilidupo.pdf
    • http://alphawolfadvertisement.com/uploads/1/3/1/0/131070246/9181505.pdf
    • http://redeyerecruitment.com/uploads/1/3/0/3/130313170/9d72f5e5d65e.pdf
    • http://karepeople.net/uploads/1/3/1/3/131398104/5913898.pdf
    • http://www.soldiercreekchurchofchrist.org/uploads/1/3/0/5/130546497/0299d4a87f743.pdf
    • http://sagadaview.com/uploads/1/3/0/7/130775304/4df65485.pdf
    • http://moonlighting.no/uploads/1/3/0/5/130543369/pumeme-guvoz-vivuxawomil-lilodedeva.pdf
    • http://jkjlawnsprinkler.com/uploads/1/3/0/6/130621216/03412.pdf
    • http://douglasbarclay.com/uploads/1/3/0/6/130620232/7623360.pdf
    • http://nicolewilliamswrites.com/uploads/1/3/1/6/131606092/juwepogeguxewu.pdf
    • http://pinnaclecoastalhealth.com/uploads/1/3/0/6/130622063/4a053e2feb478f.pdf
    • http://bergeneducational.com/uploads/1/3/0/6/130604180/464598.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_off000063d3.bin
59625e66a0d95c230e8b98a8ffe9def4634519fd5435ecccaab2798a260f9931		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D3 8396 bytes

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