Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10bef35f2388f89…

MALICIOUS

PDF

29.4 KB Created: 2020-04-27 11:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ef18fd08a02672a24d4b0425c395ac29 SHA-1: 6ea27bb0ed96126d65a6974f7d10bd85f7ce7171 SHA-256: d10bef35f2388f898c7fbb0b4838b425b53f0432c2073d8c0ab90d0959f128db
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The PDF_SEO_LINK_FARM heuristic specifically identifies this pattern, suggesting the document's primary purpose is to host a large number of links. The ML classifier also strongly indicates maliciousness. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

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://kyflowernseed.com/uploads/1/3/1/6/131606051/131606051.html#arm+motor+ability+test+pdf
    • http://crcid.net/uploads/1/3/1/6/131636843/d737577e2e.pdf
    • http://darrenmillercoaching.com/uploads/1/3/0/6/130604548/zevizidijolan.pdf
    • http://bethelevangelicalfreechurch.org/uploads/1/3/0/5/130588833/1376291.pdf
    • http://loyolamaryanddanceteam.com/uploads/1/3/0/3/130324292/8467778.pdf
    • http://mytyinc.com/uploads/1/3/0/2/130272516/xixidavezuwix-dajerenozovof.pdf
    • http://aorlandi.com/uploads/1/3/0/8/130813144/cc267028fb529.pdf
    • http://2001ndivisionharvard.com/uploads/1/3/0/8/130874109/patinojokivob-vajuxudokimod.pdf
    • http://southernbathworks.net/uploads/1/3/0/7/130775563/b2d3435b82e.pdf
    • http://halongbaytours.vn/uploads/1/3/0/3/130379151/b5614e14b7a.pdf
    • http://pcismusic.org/uploads/1/3/0/5/130551718/sodulavezimoke_wedetaj_nukote_sunevusume.pdf
    • http://robertylinmd.com/uploads/1/3/0/4/130476688/bofitilumaxe-gikoze-rudopajozepa-bofozivenerot.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_off00004e29.bin
6c96184805a60efe096f87b4a1d31da89d15d974297182f3e127d4c325834434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E29 6956 bytes

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