Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f222ab52115da21…

MALICIOUS

PDF

36.4 KB Created: 2020-04-07 19:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 162184af2219c00017db6a0ea4b6650e SHA-1: 751429491f2d7412a50b8fec8e5bab3e6a762e58 SHA-256: 3f222ab52115da21fc91319564fd51210e7fe420186ed9687edec8d416bd3f7d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, many of which point to similarly structured URLs on unrelated domains. This pattern is indicative of a link farm or SEO poisoning technique, likely intended to lure users to malicious content or to manipulate search engine rankings. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://pannypointcondo.com/uploads/1/3/0/6/130639105/130639105.html#shadow+of+war+ithildin+door
    • http://phillips-inspections.com/uploads/1/3/0/2/130272095/8a5eaf.pdf
    • http://smashbroscardgame.com/uploads/1/3/1/1/131164358/samobufudasi_zuganake.pdf
    • http://ocpoolinspector.com/uploads/1/3/0/2/130289476/kalepivural.pdf
    • http://billionnailsandspa.com/uploads/1/3/1/4/131406202/3941629.pdf
    • http://atacamaxtreme.com/uploads/1/3/0/7/130738943/efb284.pdf
    • http://suckamcbrewery.com/uploads/1/3/1/0/131069890/0299757b.pdf
    • http://myinklady.com/uploads/1/3/0/6/130620694/xagerajozenetig.pdf
    • http://circlec2c.org/uploads/1/3/0/9/130969366/5d0e57b.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_off000066d4.bin
aabfe5f78ac21cd95eab838713ad5af94881a39b0cc91beb0f6e20a2d6dd8fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D4 7768 bytes

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