Malicious PDF — malware analysis report

Static analysis result for SHA-256 b756a39f4946f5d5…

MALICIOUS

PDF

62.6 KB Created: 2020-04-17 21:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c5cb68b729482e58b718559904039400 SHA-1: 77293eaf38dae42878a3fe03ce091880f63da901 SHA-256: b756a39f4946f5d5b40177f79c011b1cf04cdc2a56819f663c8fa371b4b71606
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to unrelated content, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to 'Arsene Lupin' and the tool 'wkhtmltopdf', suggesting a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cesarvanegas.net/uploads/1/3/1/4/131453268/131453268.html#arsene+lupin+la+comtesse+de+cagliostro+pdf
    • http://allthingsparsons.com/uploads/1/3/0/2/130289158/nokulufawikosepedifi.pdf
    • http://madelinefphilbeck.com/uploads/1/3/0/6/130620708/kixaxuxagesug.pdf
    • http://makeyourdollarswork.com/uploads/1/3/0/6/130621190/giduz-mubes-babitasewonina-guximen.pdf
    • http://journeyofhappenstance.com/uploads/1/3/0/6/130621352/29e45f7653a556.pdf
    • http://concierge-psychologist.com/uploads/1/3/1/4/131438442/xixepu.pdf
    • http://kccreations322.com/uploads/1/3/0/4/130483733/fegobobax_gupakipu.pdf
    • http://rainbootsandrainbows.com/uploads/1/3/0/2/130288753/fufoxana-kitowiwevu.pdf
    • http://tanhut.net/uploads/1/3/0/6/130620296/b8fe2a035e837.pdf
    • http://lux-luz.com/uploads/1/3/0/5/130545816/2720512.pdf
    • http://tukteacompany.com/uploads/1/3/0/3/130323896/nuragodu-xipusi-josobukotoji.pdf
    • http://guysten.com/uploads/1/3/0/5/130588457/9717719.pdf
    • http://carousellearning.com/uploads/1/3/0/5/130589371/bufizokesokixe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a9a1.bin
e93a29a25b8554ce35b3983d5b254423d178c1d8203c5ae69858e53c195d797c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9A1 10408 bytes
font_01_sfnt_off0000cce2.bin
0f29c64b0b0c030ca1f41457be8c9a72656e0ee2a6c7da956445f9e2e8fefdbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE2 2816 bytes
font_02_sfnt_off0000d6da.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 16036 bytes

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