Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b25419a0ea8169…

MALICIOUS

PDF

38.8 KB Created: 2020-03-11 05:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d8992cefb563fc37da8b04cf22a5c84e SHA-1: 72326608bf271f6f195f90f85439acbbe82bbcc6 SHA-256: d1b25419a0ea8169298044da4b8652317c263bb2903dee4d72bd5ae13cd2d829
94 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, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample, and the document body content is largely unreadable, but the presence of numerous external links is the primary indicator of malicious intent.

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://www.mccorkleagsales.com/uploads/1/3/0/2/130287883/130287883.html#afterglow+headset+lvl+6+review
    • http://mrbrownmoderngent.com/uploads/1/3/0/6/130621754/bigeziginuta.pdf
    • http://jackhammermotorcycles.com/uploads/1/3/0/8/130874115/jusobedi_vegota.pdf
    • http://popuppads.com/uploads/1/3/0/5/130589070/xamiwukogefoxe.pdf
    • http://sthfromnth.com/uploads/1/3/0/7/130776277/de4ffca937.pdf
    • http://mx.richardboyum.com/uploads/1/3/0/4/130483376/liwunoxesi_gebugakuvoso_sumaweripoxofem_lizevutomega.pdf
    • http://castellanoart.net/uploads/1/3/0/6/130620747/d104c8.pdf
    • http://www.meltencinitas.com/uploads/1/3/0/7/130776328/7538484.pdf
    • http://toxicologist-katie-chiang.com/uploads/1/3/0/4/130435694/nemodibodaruj.pdf
    • http://morethansoulfood.com/uploads/1/3/0/3/130379380/5086568.pdf
    • http://www.sergiormora.com/uploads/1/3/0/5/130588957/e86b1dfad15df.pdf
    • http://philforrence.com/uploads/1/3/0/7/130739308/xixitawexazodop_midadideta.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_off00006cbd.bin
9ac9da4d59b68107da9a9bac41a51c142aab1f5610a6e6fcc62686a19c411230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBD 8332 bytes

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