Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1a82c9879c8e47…

MALICIOUS

PDF

41.0 KB Created: 2020-03-07 23:16:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e860794963604be57d832f42f86e26c2 SHA-1: 4f9f794f75084af8040d891dd61177a42c79075c SHA-256: fa1a82c9879c8e47b672d94325fe9038a4eca21dbaa541ca3e86fb0502eeddcb
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO spam campaign, likely intended to drive traffic or potentially host malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

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://huangjiayulezhinan.br3h.com/uploads/1/3/0/4/130477755/130477755.html#clima+organizacional+y+sus+dimensiones+pdf
    • http://windrush70th.co.uk/uploads/1/3/0/7/130738835/rojubuvulor.pdf
    • http://www.fiskeb�den.dk/uploads/1/3/0/6/130620197/13ece38f451f.pdf
    • http://www.cpdrillingcorp.com/uploads/1/3/0/5/130588145/3323523.pdf
    • http://jacquieohsdc.com/uploads/1/3/0/7/130739530/tuxof-kajutesur-mekemunuwixum-watit.pdf
    • http://hostmaster.seattosleep.co.uk/uploads/1/3/0/3/130313194/d51368.pdf
    • http://a-teacher-travels.com/uploads/1/3/0/6/130639467/6728469.pdf
    • http://cluedetectivepuzzleagency.life/uploads/1/3/0/4/130483753/1de7a5.pdf
    • http://10thkind.com/uploads/1/3/0/7/130775411/1954481.pdf
    • http://mrsjdodds.com/uploads/1/3/0/6/130621353/2a360fca4a.pdf
    • http://collier-pave.com/uploads/1/3/0/6/130621832/sokasowikaluxaravedu.pdf
    • http://wifi-canada.org/uploads/1/3/0/6/130620353/wojelinujaxune_wilexa_bemudatexaxabi_wijevuzikibol.pdf
    • http://www.inneralchemywellness.com/uploads/1/3/0/2/130292179/6181064.pdf
    • http://hermesmercy.com/uploads/1/3/0/3/130323337/filaf-nuriwobelejelon-merulanugugimur.pdf
    • http://milehighcommunityconnections.com/uploads/1/3/0/6/130639284/7d49be4d1.pdf
    • http://trios3dlab.com/uploads/1/3/0/3/130324050/dajukiwowif.pdf
    • http://www.surfacedesignfx.com/uploads/1/3/0/6/130639886/7930086.pdf
    • http://mindlogger.info/uploads/1/3/0/6/130620519/ec6ca53.pdf
    • http://danaroberts.com/uploads/1/3/0/4/130483329/degoj.pdf
    • http://artlifejournals.com/uploads/1/3/0/5/130542936/3a1348e08a9f711.pdf
    • http://www.srlashes.com/uploads/1/3/0/5/130589174/wirobe.pdf
    • http://gruporetolatino.com/uploads/1/3/0/7/130776162/xixetedelib.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_off000076b5.bin
d74082b451950cd151d1c9fe9efc788d4217d6bea0f63db08555011fcd64c301
pdf-font-stream PDF embedded font (sfnt) at offset 0x76B5 8100 bytes