Malicious PDF — malware analysis report

Static analysis result for SHA-256 adef9003d1121138…

MALICIOUS

PDF

44.4 KB Created: 2020-04-07 13:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1de2ba7734521b278aced166b93ca3b8 SHA-1: 9d4668c4b5f01c7e1e429c1023ae611f04caba95 SHA-256: adef9003d1121138260c2d4af0e081cdd113832a463d76350441aa20ee579b37
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted across various domains. This pattern is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict.

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://scpoolguy.com/uploads/1/3/0/6/130605420/130605420.html#ejercicios+de+multiplicacion+y+division+de+numeros+enteros+vitutor
    • http://vingraph.studio/uploads/1/3/0/5/130543798/b0cb2baabba7d19.pdf
    • http://aptosishome.com/uploads/1/3/0/4/130435892/08b9983e21.pdf
    • http://bellinghammarinesupply.com/uploads/1/3/0/2/130273743/700073.pdf
    • http://lucedutoit.com/uploads/1/3/0/6/130620478/mobil.pdf
    • http://lifestyleliving.solutions/uploads/1/3/0/7/130739664/6836286.pdf
    • http://hiltonyoga.com/uploads/1/3/0/5/130541221/222db06.pdf
    • http://theribwhip.com/uploads/1/3/0/8/130814926/kudoxapenefamef.pdf
    • http://goodfoodmovement.com/uploads/1/3/1/4/131407424/xujopozop.pdf
    • http://natureallbody4ever.com/uploads/1/3/1/0/131070302/924df4b4.pdf
    • http://scotpoole.com/uploads/1/3/0/7/130739385/wipew.pdf
    • http://staceyanderic.us/uploads/1/3/0/7/130739570/00e5c85a8851.pdf
    • http://tutoryounsu.net/uploads/1/3/0/8/130873841/bijodoxerulan_zudebix_sewowivi.pdf
    • http://molinabastos.com/uploads/1/3/0/5/130551187/subosafitefa_gusowit_wiwupevotamu.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_off000081a5.bin
518007c46a4861cc35278ea8808957c4a3a574947869cbba17a111467842ac1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A5 8868 bytes

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