Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5cf8148b5f4d5d…

MALICIOUS

PDF

30.8 KB Created: 2020-04-14 16:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c85e138dcd336dc79fab09f2c32aa6a7 SHA-1: cada33429da200a9598bbed9c87b44c4b32efce0 SHA-256: 2a5cf8148b5f4d5d6b32858e04dbc855ed341d7d0b906192dadf06957f61d3b3
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, many of which point to other PDF files hosted on similar domains. This pattern is indicative of a link farm, often used for SEO poisoning or to distribute malicious content. The document body, though heavily obfuscated, contains references to sheet music and the wkhtmltopdf tool, suggesting a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://thepatinaproject.org/uploads/1/3/0/5/130589420/130589420.html#easy+flute+sheet+music+popular+songs
    • http://ztkarl.com/uploads/1/3/0/8/130813403/ab2811e8d2d.pdf
    • http://woolnthing.com/uploads/1/3/1/0/131070521/dudawi-wanokolut-dixifevora-tizafalowoxima.pdf
    • http://susanacalachi.com/uploads/1/3/0/8/130814715/nogomakefeguweneja.pdf
    • http://servicekingac.com/uploads/1/3/0/4/130476575/gesebo-dajedu-keriwidepejeka-wunimupewab.pdf
    • http://mksassociates247.com/uploads/1/3/0/9/130969065/11ff51bdf7b.pdf
    • http://lasfinest73.com/uploads/1/3/1/4/131408340/d60f4ba.pdf
    • http://dthcontractingllc.com/uploads/1/3/0/8/130873890/bikeb.pdf
    • http://tucson-skylight.com/uploads/1/3/1/4/131452808/9660600.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_off000050aa.bin
a26e2c7d28a9db0dcaebd8d828f0451de4f79a2d477f22af5a82641d6883b8ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50AA 8100 bytes

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