Malicious PDF — malware analysis report

Static analysis result for SHA-256 f112cd14e9ff8a95…

MALICIOUS

PDF

34.8 KB Created: 2020-03-21 12:14:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c4d088683b39058227fb81dd9da4d1dd SHA-1: e91ca64bc48f4a87c54ba892e80ecf2bd53fdc8d SHA-256: f112cd14e9ff8a95cb00e52ab65db22092fbfad1964d730e03b5fcaf296c9444
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam campaign. The embedded URLs point to various domains, all structured similarly, indicating a coordinated effort to drive traffic to these sites. The ML classifier also strongly flagged this PDF as malicious.

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://toscanajoyasyaccesorios.com/uploads/1/3/0/7/130739287/130739287.html#present+simple+and+present+continuous+exercises+esl
    • http://www.honda-acccord-ex-l-byowner.com/uploads/1/3/0/7/130739987/6400177.pdf
    • http://www.mixandmatchcoathangers.com/uploads/1/3/0/7/130776502/2178114.pdf
    • http://godandscript.com/uploads/1/3/0/8/130813458/1469848.pdf
    • http://bayoubazaar.net/uploads/1/3/0/6/130621359/9180010.pdf
    • http://mountainmodelaires.org/uploads/1/3/0/7/130776745/328a1212667c96.pdf
    • http://pinkypromiseonline.com/uploads/1/3/0/3/130313507/b6567035155a92b.pdf
    • http://dumarsinc.com/uploads/1/3/0/6/130620660/pibelo.pdf
    • http://scoresgrill.ca/uploads/1/3/0/6/130621498/8369206.pdf
    • http://hartyouthforum.org.uk/uploads/1/3/0/2/130289305/jowofite.pdf
    • http://jamesmarshallporterjr.com/uploads/1/3/0/7/130738503/pijakolosi.pdf
    • http://mail.cadillacautorepair.com/uploads/1/3/0/6/130639277/5853129.pdf
    • http://www.janetmckay.com/uploads/1/3/0/2/130287506/pefagabor.pdf
    • http://lesvioliles.cat/uploads/1/3/0/5/130588206/begoke_jojutesimavi_nezefu.pdf
    • http://www.shellyjohnsonchoong.com/uploads/1/3/0/3/130313053/sunis.pdf
    • http://kurokobrothers.com/uploads/1/3/0/6/130604416/pojudeminijoneped.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_off00005fe4.bin
cf55db175749ef5c744431da4fcb265dc0903144becc969da5416b4b0c0b6d5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE4 7532 bytes

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