Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd5c543caecd67c…

MALICIOUS

PDF

39.7 KB Created: 2020-04-03 04:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7f007ea98fcabe16c54727cf6b89740 SHA-1: 1657fd5c80077d2f8d6284f058f3097a9d4a3c77 SHA-256: 8bd5c543caecd67cd9916f9a92032b25e5ea97a7646113ea12f64be97bf4b46a
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named and hosted on various domains. This pattern is indicative of a link farm or SEO poisoning technique, designed to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that the embedded links are intended to lead users to harmful content, likely for further exploitation or credential harvesting.

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://tattedafakasifitness.com/uploads/1/3/0/5/130551140/130551140.html#cuales+son+las+necesidades+basicas+del+ser+humano+segun+maslow
    • http://pof-appvoicecall.com/uploads/1/3/1/0/131069839/fff19284ad284d.pdf
    • http://sethspartanempire.com/uploads/1/3/1/4/131407549/detusodefe.pdf
    • http://thebullyban.com/uploads/1/3/0/5/130588461/4efc680c5.pdf
    • http://happypaws415.com/uploads/1/3/1/3/131383744/4961514.pdf
    • http://sbonchic.com/uploads/1/3/0/9/130969874/rumotixezokupi-banididelofozun-jupuzasorez.pdf
    • http://wbuk-london.com/uploads/1/3/1/4/131438242/rulemobugoveru.pdf
    • http://beaverheadelectric.net/uploads/1/3/1/4/131483488/bc376c.pdf
    • http://renegade.blue/uploads/1/3/0/9/130969940/leriziwagapop_nomafiwetowiwa.pdf
    • http://deesty.fr/uploads/1/3/0/2/130270895/sizosaxaxubureg_vazawuvenabogu.pdf
    • http://alyssavelasco.com/uploads/1/3/0/6/130621195/renagoxipobebivedep.pdf
    • http://mattbel.com/uploads/1/3/0/7/130739830/xulax_mutijip.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_off00006fc9.bin
b2cbb9a3927f740cf285287c8733f047c3aebab90924addc7d82da1e55596b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC9 8652 bytes

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