Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4749468f8c638a4…

MALICIOUS

PDF

46.5 KB Created: 2020-04-08 09:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2dbff504483ad0d05521e1a273275f6a SHA-1: d1d000db6092bbf9c45e10012a664492665c8bbd SHA-256: c4749468f8c638a49d05f95a545773aa7e86d04e1a091ac9a21f55ddc8be85fc
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 are disguised as academic or technical documents, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The document body text, though partially corrupted, suggests a lure related to a 'solution manual'. No scripts were extracted, and the primary malicious activity appears to be the distribution of numerous external URLs.

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://cklcustoms.com/uploads/1/3/0/4/130435930/130435930.html#nilsson+electric+circuits+9th+solution+manual
    • http://everythingbasset.com/uploads/1/3/0/5/130590008/ritewu.pdf
    • http://resortbuyout.net/uploads/1/3/0/5/130551390/joxiwopomamop-wixasigewufu.pdf
    • http://xiangrisanhe.com/uploads/1/3/1/1/131164564/mamotexaro.pdf
    • http://abcandlesco.com/uploads/1/3/0/2/130287992/736cedb3b495c0b.pdf
    • http://littlestofthings.com/uploads/1/3/0/8/130814110/pidadenevopekejever.pdf
    • http://jamisonretirement.com/uploads/1/3/0/7/130775707/mosotofozam-gotomejakip-tilis.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_off00008b06.bin
528dc7d699b803a42a79da600aa4bf5316f12e304b4eb1cb53a34ba0ef54f5e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B06 9304 bytes

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