Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e46af4cbcab672…

MALICIOUS

PDF

44.1 KB Created: 2020-03-20 05:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e03f12a38ae35d29b9f7a710ff9115ca SHA-1: 7c8a17ecee1222ec057e1ab580e783b7f852a012 SHA-256: f1e46af4cbcab67275891f32f4f9190719fc341fa1d3a5be626e8b2ac2700937
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique commonly used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The document body contains a mix of seemingly unrelated text and URLs, reinforcing the link farm hypothesis. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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://beingself-centered.com/uploads/1/3/0/7/130776714/130776714.html#best+side+by+side+refrigerator+counter+depth
    • http://jmarketingco.com/uploads/1/3/0/6/130605374/fc007.pdf
    • http://pvbcommunications.com/uploads/1/3/0/3/130323167/8b05090.pdf
    • http://john-kuniversal.com/uploads/1/3/0/7/130739188/503267.pdf
    • http://www.brianbentonart.com/uploads/1/3/1/0/131070216/7330122.pdf
    • http://budburstwine.com/uploads/1/3/0/5/130589180/ximeperitoneleleb.pdf
    • http://mikefaverman.com/uploads/1/3/0/4/130490056/jidefobodise_jeweneboso_kabonozatepux.pdf
    • http://themeforast.com/uploads/1/3/0/5/130590435/8748112.pdf
    • http://hollowbrookstables.com/uploads/1/3/0/2/130289569/rivedukepu.pdf
    • http://moderneroticart.com/uploads/1/3/0/6/130605119/gosexozujebokazu.pdf
    • http://wizteamwork.com/uploads/1/3/0/6/130622009/juvugedafefalurav.pdf
    • http://hostmaster.dkirkwood.co.uk/uploads/1/3/0/7/130776642/javedupuvu-tijojegibud-duxox-posurubi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e83.bin
1f22770b46a114cd901f4b4ecd907576684368bdfbae862ac16d9f0003a074ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E83 8116 bytes
font_01_sfnt_off00008e06.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E06 16036 bytes

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