Malicious PDF — malware analysis report

Static analysis result for SHA-256 db95920ff9b83c1f…

MALICIOUS

PDF

37.8 KB Created: 2020-04-06 14:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f38f6227417db666f6076177539c43e3 SHA-1: 26847d8b3604b7c3f338cfcc946fcfc54bf4db2f SHA-256: db95920ff9b83c1feaeb60db68d6ea06bfa59375f0cee3c62a294ffd11b2224f
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains URLs that are part of this link farm. The primary attack pattern appears to be a link farm designed to manipulate search engine results or to distribute malicious content via these numerous external links.

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://backyardsanctuarydfw.com/uploads/1/3/1/4/131408027/131408027.html#relaciones+individuales+de+trabajo+en+mexico+pdf
    • http://bellgia.com/uploads/1/3/1/3/131380915/6789085.pdf
    • http://refinanceaurora.com/uploads/1/3/0/6/130603874/960eb790d1a.pdf
    • http://jimability.net/uploads/1/3/0/6/130604369/7dd95f.pdf
    • http://westgarretevents.com/uploads/1/3/0/2/130272577/jazegebowigu_loxovawisowev_vejegada.pdf
    • http://projectphxhome.com/uploads/1/3/0/5/130590380/tinumowi.pdf
    • http://utpb.me/uploads/1/3/0/5/130588878/gamiwo.pdf
    • http://kessproductions.com/uploads/1/3/0/8/130813840/rinozijijatav.pdf
    • http://kuolcatsavings.com/uploads/1/3/0/7/130738501/4107532.pdf
    • http://ryanzilker.com/uploads/1/3/0/3/130313027/3723962.pdf
    • http://atlanta-hotel.co.uk/uploads/1/3/0/8/130874055/mepipuxegazifapojaf.pdf
    • http://laurabotzongyoga.com/uploads/1/3/0/9/130969571/zeruko_silizatim_lipiwonaf.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_off00006a6d.bin
fa82f79236b2c251a63110b2d96f45b855e0f2591207b3a7b21579b139e0a297		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6D 8140 bytes

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