Malicious PDF — malware analysis report

Static analysis result for SHA-256 115da437b72ff630…

MALICIOUS

PDF

35.5 KB Created: 2020-03-29 07:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: efdc6f3ac1e205ed53067ac74791b309 SHA-1: de420daa85d5db9bc5984ea26c3c77cd024b73be SHA-256: 115da437b72ff6307a6e4e57ec6efa83ed547c3aa815bae25493e0c5cee0be0e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. The document body, though partially corrupted, contains a URL that is also present in the heuristics and IOCs. This suggests the primary purpose is to redirect users to a network of linked content, potentially for SEO manipulation or to serve as a distribution point for further malicious activities.

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://colddiamnd.com/uploads/1/3/0/2/130272278/130272278.html#libros+de+geometria+descriptiva+2
    • http://carlsonlab.info/uploads/1/3/0/6/130604269/4387146.pdf
    • http://autodiscover.karriemichelle.com/uploads/1/3/0/7/130776174/sekidezitib.pdf
    • http://www.freedombagz.com/uploads/1/3/0/6/130640225/bipufubikufu.pdf
    • http://artforhumanity.ca/uploads/1/3/0/7/130739510/ea45f8535.pdf
    • http://broncoslocker.com/uploads/1/3/0/4/130488530/sipudozunesi_kilita_fotaboramin.pdf
    • http://ashishyadav.com/uploads/1/3/0/4/130488228/bosedupow-tebewu.pdf
    • http://illuminationwellnessnc.com/uploads/1/3/0/6/130604202/zazurepovumipi.pdf
    • http://binarybotreviews.com/uploads/1/3/0/6/130620819/nuruvo.pdf
    • http://amplifyprintsolutions.com/uploads/1/3/0/6/130604386/2484137.pdf
    • http://presidentialcigarden.com/uploads/1/3/0/8/130874615/nuzosiser-jekexik.pdf
    • http://mail.rmi.hr/uploads/1/3/0/5/130589214/c7fbb87399b.pdf
    • http://kimtagge.com/uploads/1/3/0/6/130604255/tatidewotova.pdf
    • http://arcofbrowncounty.org/uploads/1/3/0/3/130313179/jipovefu.pdf
    • http://dentalcards.co.uk/uploads/1/3/0/4/130436145/2195541.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_off0000622a.bin
efad165ea371516894629fd085b9ee3f5cdfb9519d5641da2e0f14db82cf06f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622A 8468 bytes

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