Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6feb5d83c1d0d8…

MALICIOUS

PDF

37.3 KB Created: 2020-05-22 03:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5bcf2b00f86fee67a3831b785bfa5a4 SHA-1: cb0b5dc39d707e95afcc034669e919c1ae499634 SHA-256: 9f6feb5d83c1d0d8a0dccd561d65de0d17146fdeaa49f8f2d8f7ebd0c6347558
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, many of which point to similarly structured URLs on different domains. The document body text, while containing a seemingly nonsensical question, also includes the same URLs, suggesting a deliberate attempt to direct users to these external resources. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm, a common tactic for distributing malware or phishing content.

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://74-123-77-220.mgwnet.com/uploads/1/3/0/6/130604215/130604215.html#why+didn+t+klutz+any+homework+on+saturday
    • http://yakitorimo.com/uploads/1/3/0/7/130739188/savogibobumaj.pdf
    • http://lify.us/uploads/1/3/0/2/130289400/vosotiwapemok_magedanametulo.pdf
    • http://1951phs.com/uploads/1/3/0/6/130621409/9728119.pdf
    • http://labour2030.org/uploads/1/3/0/5/130539416/6297195.pdf
    • http://flavoreffects.com/uploads/1/3/1/3/131379992/wetosivuzejedasotabu.pdf
    • http://ambmgnt.com/uploads/1/3/1/6/131636697/lisipirurajudu.pdf
    • http://nmswrites.com/uploads/1/3/1/3/131398094/mesunukutiv-pixax-kowaxutulutodin.pdf
    • http://galaxymediapro.net/uploads/1/3/0/4/130488934/494551.pdf
    • http://mta-sts.mail.skyfieldtropical.org/uploads/1/3/1/6/131636664/9804707.pdf
    • http://mystudiodesk.info/uploads/1/3/0/3/130379063/zisojam.pdf
    • http://theperfectpourdartmouth.com/uploads/1/3/1/4/131452929/7aabd55a10.pdf
    • http://tbcrh.org/uploads/1/3/0/3/130313359/wizigafumoraxejazef.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_off000065c5.bin
dbb42e9c9ee91b28d474a88cce260f0081848872b20db365d3616b6035eadac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C5 10612 bytes

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