Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9be41b502c6dc36…

MALICIOUS

PDF

44.5 KB Created: 2020-03-06 16:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d0253ccb274b9b82d5658487c614d65a SHA-1: f5a9973e0ecd27a818630a6353685dfc5100bd4d SHA-256: b9be41b502c6dc3673fa6335f3ff014b216f982d2cc77496b28607b32dc07295
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to similarly structured URLs on different domains, indicating a link farm or SEO spam operation. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely serve as a lure to redirect users to potentially malicious websites or download further payloads.

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://zhajinhuayulecheng.br3h.com/uploads/1/3/0/9/130969243/130969243.html#physical+therapy+exercises+for+acl+surgery
    • http://reflectionintrospection.net/uploads/1/3/0/7/130776760/pajavoleti.pdf
    • http://hostmaster.kadianpow.com/uploads/1/3/0/3/130379381/wesowilozulub.pdf
    • http://strangecakegames.com/uploads/1/3/0/7/130775727/9624318.pdf
    • http://www.thesoulref.com/uploads/1/3/0/7/130776344/4210630.pdf
    • http://www.virtuouscurvesboutique1.com/uploads/1/3/0/4/130435725/8480146.pdf
    • http://www.o2oking.co/uploads/1/3/0/6/130640094/5c73b5f68e2.pdf
    • http://keith-allred.com/uploads/1/3/0/4/130488934/e17250f289fd.pdf
    • http://moviebuffet.net/uploads/1/3/0/6/130620952/xikomixaleledit-xojurena-vujituraridu.pdf
    • http://k12.business/uploads/1/3/0/7/130738971/9f06322490ea04.pdf
    • http://nabeelreviews.com/uploads/1/3/0/2/130289662/kopofejagalip.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007247.bin
c68cc132d599844d0c2a8622a028ccda945c67783269d5a165680569f8a2bea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7247 7600 bytes
font_01_sfnt_off00009011.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9011 16036 bytes

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