Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc948f29f4883f7e…

MALICIOUS

PDF

38.8 KB Created: 2020-03-27 02:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32500255962e3066bc6abe4c83d922ec SHA-1: a1aeaf6a8eb2ad6cdbfda4442f0b8d520b99c5d1 SHA-256: fc948f29f4883f7e9e421db8796dba1e41918762408dfdaf00b9b3400c970d5f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text that appears to be a lure for search engine optimization, directing users to numerous PDF files hosted on various domains. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification. The primary attack pattern involves directing users to a network of linked documents, likely for malicious redirection or SEO spam.

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://tilitoimistoanjasimola.com/uploads/1/3/0/7/130776277/130776277.html#10+ejemplos+de+empresas+publicas+en+mexico
    • http://bellalusso.us/uploads/1/3/0/7/130739936/79bb2951f4120.pdf
    • http://www.sageshelley.com/uploads/1/3/0/8/130814122/9994122.pdf
    • http://masstragerl.com/uploads/1/3/0/7/130738758/2995076.pdf
    • http://flintcaucus.org/uploads/1/3/0/5/130539329/dujogokalemo.pdf
    • http://mynaturalbliss.com/uploads/1/3/0/5/130588463/4e378e17bb1c282.pdf
    • http://aylesburynaturalburials.com/uploads/1/3/0/6/130604500/vezazewovo.pdf
    • http://www.peacockaerialpictures.co.uk/uploads/1/3/0/7/130740393/susobiju.pdf
    • http://sparkleandshinepools.com/uploads/1/3/0/6/130639658/gevebimopej.pdf
    • http://esayouthsports.com/uploads/1/3/0/6/130620520/6909060.pdf
    • http://chinamarket.consulting/uploads/1/3/0/7/130775295/4510909.pdf
    • http://backwoodsfirearmsandammo.com/uploads/1/3/0/6/130605018/2751305.pdf
    • http://niro-metal-design.com/uploads/1/3/0/4/130476288/litaniv.pdf
    • http://www.rooseveltufsd.co/uploads/1/3/0/4/130477278/forogi.pdf
    • http://elegancelights.com/uploads/1/3/0/6/130604645/5324513.pdf
    • http://www.restaurantrealtalk.com/uploads/1/3/0/4/130436365/wigoduwegujidik.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_off00006ce3.bin
f2f43f0982a5cc9d7c6fb72a6300a47e7cc277bfc28f2c04d49bd7124bb78898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE3 8596 bytes

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