Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5957734089a705…

MALICIOUS

PDF

60.1 KB Created: 2020-04-09 11:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9ed0d9a15fd46248ceb4be0ad3154780 SHA-1: 2aefec7a26a37f00dd96ea808fb55f94bedb15bd SHA-256: 5c5957734089a7055ecb5db2bc9b8df2fe757d69b47461342f63b6af8450e7bc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO spam campaign. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains some of the URLs, reinforcing the idea that the primary purpose is to redirect users to external, potentially malicious, content.

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://freaklunches.com/uploads/1/3/0/6/130620207/130620207.html#faringitis+aguda+pdf+pediatria
    • http://wyndapp.com/uploads/1/3/0/8/130815140/ginemapata.pdf
    • http://heinzbassets.com/uploads/1/3/0/8/130874691/ba2b75.pdf
    • http://heidihackford.net/uploads/1/3/0/3/130313090/9643823.pdf
    • http://merryhillcbd.com/uploads/1/3/0/6/130603743/5391186.pdf
    • http://misslamoda.com/uploads/1/3/0/4/130489649/diniwir-nazozebexotoba.pdf
    • http://lmwilliamsnovels.com/uploads/1/3/0/8/130874439/2304453.pdf
    • http://headsupsomerset.org/uploads/1/3/0/5/130590461/vafaxojukad.pdf
    • http://thecompoundenterprise.com/uploads/1/3/1/4/131407353/wujilukofox.pdf
    • http://cinderscapesorl.com/uploads/1/3/0/8/130874496/9d113fc0ef1f38.pdf
    • http://te-alton.com/uploads/1/3/0/2/130289754/vowetuvev_bezewulo.pdf
    • http://cowboyeventing.com/uploads/1/3/0/5/130539913/ccbc4a.pdf
    • http://shearelegancealterations.com/uploads/1/3/0/8/130874400/muropubolu.pdf
    • http://altragoodjerky.com/uploads/1/3/0/8/130814178/6761777.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aca0.bin
55a82aacc2c483ad52cf941e94eb8fe51832c551ed252498a7d9095e095d4b01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACA0 8728 bytes
font_01_sfnt_off0000cc49.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 16036 bytes

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