Malicious PDF — malware analysis report

Static analysis result for SHA-256 b538fc1a711d182d…

MALICIOUS

PDF

54.4 KB Created: 2020-04-04 07:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d1f80c489d5bc3ac48ff7a964292ba4d SHA-1: ed2ea395d88efe0b4ff93d6383920de1d6e17ab2 SHA-256: b538fc1a711d182d24e21747033004d87833ed9c9f686180296d9471b5101452
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files hosted on various domains. This pattern is indicative of a link farm designed to manipulate search engine rankings or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://uciom.com/uploads/1/3/0/6/130604723/130604723.html#how+to+sharpen+garden+tools+uk
    • http://gormansgraphics.com/uploads/1/3/0/3/130313156/mizopufekaru.pdf
    • http://manilavegans.org/uploads/1/3/0/7/130739180/weduno.pdf
    • http://seconddaydust.com/uploads/1/3/0/6/130639791/8b6640941a9167.pdf
    • http://btwtalentshow.com/uploads/1/3/1/4/131437881/1995868.pdf
    • http://alpha-goat.com/uploads/1/3/0/6/130604259/caa0604.pdf
    • http://avrnacllc.com/uploads/1/3/0/8/130873848/zofepuzulota.pdf
    • http://danielamora.com/uploads/1/3/0/7/130738912/pajababikumaso.pdf
    • http://cv.expert/uploads/1/3/1/3/131379559/8e0011c2823c35.pdf
    • http://legionsupplements.net/uploads/1/3/0/6/130620657/xuwozebazebomuremap.pdf
    • http://alero.biz/uploads/1/3/0/3/130324292/birelusu.pdf
    • http://tlcfaithfoundation.net/uploads/1/3/0/5/130551756/4162850.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b26.bin
30eb9a249733b4db7c1df3eac86e50a4df15402ff16f23597e81376ba6f3a7c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B26 8780 bytes
font_01_sfnt_off0000ac9f.bin
2faf3b174afa5eb158d723cfd3ba4e37b4859eff1362dd251119091b4a46f47e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9F 3144 bytes
font_02_sfnt_off0000b787.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB787 16036 bytes

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