Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c5d4a37615b35e…

MALICIOUS

PDF

38.3 KB Created: 2020-03-20 03:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 62c9438b492dd7711ea9cf714e169e31 SHA-1: ce98839fc1b9eb64ac52f15d70f072ade4747bd2 SHA-256: 65c5d4a37615b35ef853da8bb0889ab33a0503e6d51bf0d675b835a7edff2a38
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a distribution point for further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of external links is highly suspicious.

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://santexrealestate.com/uploads/1/3/0/3/130379246/130379246.html#ejercicios+sobre+cocientes+notables+pdf
    • http://revelationsmagazine.com/uploads/1/3/0/4/130489833/2466543.pdf
    • http://shopdubiasrus.com/uploads/1/3/0/8/130814178/toroxik.pdf
    • http://brittanycollinge.com/uploads/1/3/0/8/130814758/wajotejiwol.pdf
    • http://artofthefilm.com/uploads/1/3/0/4/130483428/8446393.pdf
    • http://coupleseftcenter.com/uploads/1/3/0/4/130476146/xeruwugivudof-bomejo.pdf
    • http://cpanel.medien.com.my/uploads/1/3/0/6/130620546/xibaletapobofoguv.pdf
    • http://fortune500resume.com/uploads/1/3/0/4/130483341/lunabawe-gubavetug-suzusivi.pdf
    • http://kfeltglobal.com/uploads/1/3/0/6/130640232/gadim-tuvamowo.pdf
    • http://mobilityfamily.com/uploads/1/3/0/3/130379146/9243589.pdf
    • http://questionmarklondon.com/uploads/1/3/0/5/130543155/pureti.pdf
    • http://grandmacards.com/uploads/1/3/0/7/130775401/4348803.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_off000069af.bin
e085662777015235515241ad55fe19ce0318d18be18571b1645a0826673e2f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AF 9156 bytes

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