Malicious PDF — malware analysis report

Static analysis result for SHA-256 30994e52fbb5f089…

MALICIOUS

PDF

42.1 KB Created: 2020-04-08 03:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fbc887528916f0c6155e648c4978e411 SHA-1: 90e47e075e642191469ee92725fc89795bc1e1e3 SHA-256: 30994e52fbb5f0895f8af771f992ee815cc6f353c6310386e07f5e9b54ad4818
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs point to various PDF files hosted on different domains, suggesting a link farm or distribution network. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://info-max.ca/uploads/1/3/0/7/130775465/130775465.html#youtube+nahko+bear+aloha+ke+akua
    • http://small-stuff-design.com/uploads/1/3/0/7/130776786/batumufuxu_foseval.pdf
    • http://meredithbell.org/uploads/1/3/1/4/131407061/lurigojiviponazufa.pdf
    • http://telluridemushroomfest.org/uploads/1/3/0/6/130603802/zaxoj.pdf
    • http://mirigubler.com/uploads/1/3/0/3/130313113/pagafozinaz_xegututo.pdf
    • http://headwaterscorp.us/uploads/1/3/0/4/130483341/fikujep.pdf
    • http://macherieboutique.com/uploads/1/3/0/4/130477566/golazozewetapig.pdf
    • http://christinyouministry.com/uploads/1/3/1/3/131384667/gilolenifogana.pdf
    • http://alycesmithhair.com/uploads/1/3/1/3/131381991/17b887376ca.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_off0000576d.bin
4a53a42bc47e25ccb3ade6842f39077d6e69e234ac9c6d89ed393ea533fea64c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x576D 7340 bytes
font_01_sfnt_off00007433.bin
2c63176390fa9b25ce4b643fd2e364bfce9fcf19ecf3c857c9db7149ad7d4846		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7433 16160 bytes
font_02_sfnt_off00008949.bin
40a3e38808bba6c35b2ed8aabf9fb48a34f41e0892875e16000d863ba22a9266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8949 6408 bytes

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