Malicious PDF — malware analysis report

Static analysis result for SHA-256 328f06ca9b2cc223…

MALICIOUS

PDF

41.3 KB Created: 2020-03-26 02:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dbd104296d2101ab2e1a3521d85c0c6c SHA-1: f5d5e4b67a2569449e4f4654ee21b95b996bf6d7 SHA-256: 328f06ca9b2cc223c6da3dad9d02df6c82d24864bc40e07af865f835daad3e22
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains text related to 'Daiwa legacy massage chair price' and the wkhtmltopdf application, indicating a lure to external content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://wordsmith-sg.com/uploads/1/3/0/6/130621856/130621856.html#daiwa+legacy+massage+chair+price
    • http://licensedtolight.com.au/uploads/1/3/1/0/131070506/ac673c9.pdf
    • http://glassguysauto.com/uploads/1/3/0/5/130551267/roweworumovit-wepuza-zigafi-zoketajamuva.pdf
    • http://octsummershow.com/uploads/1/3/0/5/130542755/xegipisatuta-soxinudazi.pdf
    • http://vantagetactical.net/uploads/1/3/0/3/130324292/2681302.pdf
    • http://www.diamondwoolpadco.com/uploads/1/3/0/6/130639837/93180ecc.pdf
    • http://dogsrulesj.com/uploads/1/3/0/6/130621940/b1316abbd8d9d5.pdf
    • http://www.apple-blossom-rabbitry.com/uploads/1/3/1/1/131164506/f3ac15cd5ab1b.pdf
    • http://joulukortit.net/uploads/1/3/0/6/130621292/f9ae5.pdf
    • http://www.justusgirlsonline.com/uploads/1/3/0/4/130489054/wopigawilazedu_kawamet.pdf
    • http://number120designs.com/uploads/1/3/0/2/130271154/sajexe-lepesodipepujoj-pimona.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_off0000793b.bin
6cf6f905bf53499a8c4a2b8a507b8fb9207e79b5ab468d1c8f4b3d1d245fa259		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793B 8116 bytes

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