Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf62cd42f5a10619…

MALICIOUS

PDF

40.0 KB Created: 2020-04-06 07:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c6d1e5c66ba297ace7364d29bda594f7 SHA-1: 8f9e11bdf1a1fd47ce66aa68a7f21b943e8bb23f SHA-256: cf62cd42f5a106199f8b5eae6ff4170d9ce4e8e90db68fec216753dc93f06f4b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The ML classifier strongly indicated maliciousness. The presence of a large number of SEO-optimized PDF links suggests an attempt to manipulate search engine results or distribute malicious content through a wide network of seemingly innocuous documents.

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://myscentsandessentials.com/uploads/1/3/0/7/130738830/130738830.html#nightshade+andrea+cremer+movie
    • http://autodiscover.c3power.org/uploads/1/3/1/4/131438248/ligusi.pdf
    • http://myapexfitness.com/uploads/1/3/0/5/130551653/8032392.pdf
    • http://mail.wremac.com/uploads/1/3/1/0/131070376/buvivojejoresudef.pdf
    • http://ideasdesignservices.com/uploads/1/3/1/3/131380081/1571845.pdf
    • http://southerncommunitystudy.com/uploads/1/3/0/4/130476277/4128552.pdf
    • http://gymripstick.com/uploads/1/3/0/8/130874130/d6c45b6f14.pdf
    • http://cumminscottages.com/uploads/1/3/0/8/130874647/bafogurutedezatepi.pdf
    • http://westshoreprojects.com/uploads/1/3/0/5/130590403/veluvobibila.pdf
    • http://conectatestore.com/uploads/1/3/0/6/130604335/jezeviritobo.pdf
    • http://billbrice.info/uploads/1/3/0/6/130603968/2349958.pdf
    • http://constancerosehouse.net/uploads/1/3/0/5/130588230/3658167.pdf
    • http://kimberlyruthyoga.com/uploads/1/3/0/3/130313632/ludimako-nakuzibavotaxar-jilanagufipij-milugurunubi.pdf
    • http://centralamericaspecialties.com/uploads/1/3/0/4/130488955/tebajisemenapijaje.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_off0000747a.bin
37f1278c3c7fd750b00e58225513af1e41d3f583cb14be35bc134e011fa63158		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747A 7876 bytes

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