Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6575b3350b02762…

MALICIOUS

PDF

42.3 KB Created: 2020-03-29 02:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7f3ee4a7853b77b87e85f81a3547fe5 SHA-1: 093326af3909deddd12d8aaa3852dd9ee9fa2010 SHA-256: c6575b3350b02762195663435f3f7ae549b1a6750b134b711c95169b3bc0ffd7
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains a reference to the first URL, suggesting a lure or redirection mechanism. The primary purpose appears to be distributing links to other potentially malicious content or for SEO manipulation.

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://allergy.mediutopia.com/uploads/1/3/0/5/130588654/130588654.html#how+the+grinch+stole+christmas+book+full+text
    • http://pugetsound-dreamhomes.com/uploads/1/3/0/6/130620679/wesitakedikal.pdf
    • http://condosinmanila.com/uploads/1/3/0/3/130313002/ginosofukok_mebum.pdf
    • http://www.lauraleenutrition.com/uploads/1/3/0/5/130590482/jojenudeseduxuf.pdf
    • http://theprojectretail.net/uploads/1/3/0/3/130379065/nomejube.pdf
    • http://www.euro-tres.com/uploads/1/3/0/7/130740597/puvotupewidi.pdf
    • http://nirunutrition.com/uploads/1/3/0/6/130603968/7075548.pdf
    • http://beautyforbrokebabes.com/uploads/1/3/0/2/130270893/jubigodula-xifovonibivinu-nejif-niwugu.pdf
    • http://jennifergnagefritz.com/uploads/1/3/0/5/130545636/7199885.pdf
    • http://postboxsucks.com/uploads/1/3/0/8/130814120/vonabutidoxaj.pdf
    • http://designityourselfweddingrentals.net/uploads/1/3/0/6/130604294/4283280.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_off00007cf8.bin
2387466aca8312829be6ae70d95afb0b8e1ec19e6b5474519abc011906a42dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF8 8172 bytes

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