Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee1c1aaa031fe07…

MALICIOUS

PDF

42.9 KB Created: 2020-04-02 06:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e83b091c13700a262e6ae85fa209815c SHA-1: 5935f4491846f08f61e3aa2deb3709985e5c7a0c SHA-256: aee1c1aaa031fe077803e3d161bca296b9b5574fa75546b242628f1a0fa9dff3
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to numerous PDF files hosted on various domains, suggesting a link farm or SEO spam campaign. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample.

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://99high.com/uploads/1/3/0/9/130969158/130969158.html#materialismo+historico+estructura+economica
    • http://tommytaylorusa.com/uploads/1/3/0/2/130289392/nutir.pdf
    • http://katemariehollowsevephotography.com/uploads/1/3/0/7/130739375/05a498f6da7.pdf
    • http://drakebettis.com/uploads/1/3/0/2/130272332/8798272.pdf
    • http://mishevski.de/uploads/1/3/0/8/130874127/bemomafu.pdf
    • http://pinheadsquilting.com/uploads/1/3/1/3/131383207/0140fce.pdf
    • http://grantvegan.com/uploads/1/3/0/3/130323750/4664281.pdf
    • http://denicemarcel.com/uploads/1/3/0/4/130477152/julexojanaxofozorena.pdf
    • http://jimmiefbennet.com/uploads/1/3/0/4/130488820/739575be3.pdf
    • http://swfldogdiving.net/uploads/1/3/0/3/130323465/5abb6.pdf
    • http://pinetreecottage.com/uploads/1/3/0/6/130621707/xufumiwete.pdf
    • http://lyricalarmy.com/uploads/1/3/0/3/130323889/4170282.pdf
    • http://alittlebitofsomething.today/uploads/1/3/0/8/130874122/1595406.pdf
    • http://landofilluminatedseers.com/uploads/1/3/0/8/130874647/1800352.pdf
    • http://lisadyerauthor.com/uploads/1/3/0/4/130483682/kojezusuloxebi.pdf
    • http://upperfallsrealestate.com/uploads/1/3/0/9/130969455/jibanudi.pdf
    • http://gosolovacations.com/uploads/1/3/0/6/130604631/6025057.pdf
    • http://breslinep.com/uploads/1/3/0/4/130476720/vuwitaf.pdf
    • http://lashesbyalyssaabq.com/uploads/1/3/0/5/130539048/47261.pdf
    • http://elitesolarllc.net/uploads/1/3/0/6/130605120/mexuwudijo-gukewavefe-garalerafoxe-romasonun.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_off00007e15.bin
7f58e053d11653b6643a5bc4d251372fcc6bf2d04ab735fadad5883548411fd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E15 8144 bytes

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