Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6d6f4b14340ba5…

MALICIOUS

PDF

43.4 KB Created: 2020-03-27 05:55:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 349c865de165ac314d8f4a7dcb3bf2a2 SHA-1: 4cf783191f6a6f3c6c986f3fcd5cb38997751a60 SHA-256: 1a6d6f4b14340ba5770ed2d9c39933e87dc5582df1b3a116dd3ce560e25db186
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

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://healthycarolinas.com/uploads/1/3/1/3/131398597/131398597.html#beats+studio+2+wireless+pairing
    • http://aoiiosu.com/uploads/1/3/0/7/130776446/sosekesafomof.pdf
    • http://scrubbedup.co.nz/uploads/1/3/0/5/130588654/59372feef1b1.pdf
    • http://ujwalinvestment.com/uploads/1/3/0/5/130551011/4138569.pdf
    • http://rescuekitty.net/uploads/1/3/0/4/130483552/nipubebiz.pdf
    • http://naomiandco.com/uploads/1/3/0/5/130550859/3154565.pdf
    • http://tedrabinowitzcopywriter.net/uploads/1/3/0/7/130739333/livepo-tifetuf-xaxolivigokeper.pdf
    • http://thelakesidesun.com/uploads/1/3/0/5/130590191/78ef5ed.pdf
    • http://quickzap.net/uploads/1/3/0/4/130491444/7701538.pdf
    • http://corp.en-linea.com/uploads/1/3/0/4/130476237/5122705.pdf
    • http://depann.net/uploads/1/3/0/2/130272363/576310.pdf
    • http://zaksdb.com/uploads/1/3/0/8/130874501/0a2e9ab88d8.pdf
    • http://kocktailswithkb.com/uploads/1/3/0/4/130476541/sowenixukaxa.pdf
    • http://montanatcone.com/uploads/1/3/0/5/130590363/ronuvolexerafud.pdf
    • http://civillifer.com/uploads/1/3/0/6/130621280/3872443.pdf
    • http://aaccampuk.com/uploads/1/3/0/5/130543289/3072800.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_off00007edd.bin
f33cc041f4a93bff73f909039c3bc8487dd1a64c27c0e2ecd616f6ee7de02a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDD 8312 bytes

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