Malicious PDF — malware analysis report

Static analysis result for SHA-256 65337f2fdaa31e1a…

MALICIOUS

PDF

38.2 KB Created: 2020-03-16 14:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3deacc799df1168b63f84283b1537faf SHA-1: 614b243bdcb28695048f4ca538bc693842bd04c8 SHA-256: 65337f2fdaa31e1a1fe64b34eb5e65a71794cc6d8bc9dcf568c26b0fcf256d51
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links, many pointing to other PDF files, which is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the sheer volume of outbound links suggests an attempt to direct users to potentially compromised or malicious sites.

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://tec-commodities.org/uploads/1/3/0/2/130272483/130272483.html#principales+caracteristicas+de+los+grupos+nomadas
    • http://www.topsyturvyfitness.ca/uploads/1/3/0/2/130291527/litizanuwinanoj.pdf
    • http://nickyarthur.com.au/uploads/1/3/0/6/130621988/d898c.pdf
    • http://brautbecher-hochzeitsbecher-geschenke.de/uploads/1/3/0/5/130538833/9696025.pdf
    • http://mta-sts.mail.eatwithjames.com/uploads/1/3/0/4/130477719/gorutowewidozex_zugizexixenomu_luwunadarog_fumagoxas.pdf
    • http://mail.lavalstgermain.com/uploads/1/3/1/0/131069840/tupis.pdf
    • http://groupejobinassurances.ca/uploads/1/3/0/5/130539049/lutek.pdf
    • http://atombombbikini.net/uploads/1/3/0/3/130312937/kiwefowemo.pdf
    • http://www.juniperfarm.us/uploads/1/3/0/6/130621467/vupomuxaxisas-pupuzalabazapa-givulawa.pdf
    • http://uwewidmann.com/uploads/1/3/0/4/130490410/6071898.pdf
    • http://www.gordon-real-estate-advisors.com/uploads/1/3/0/6/130620791/vivupu.pdf
    • http://sellitfastproperties.com/uploads/1/3/0/6/130620320/3611480.pdf
    • http://spicysnack.com/uploads/1/3/0/4/130483236/notowefufajowutigeda.pdf
    • http://www.hoevedemolenhorst.nl/uploads/1/3/0/6/130605071/6193804.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_off00006a31.bin
d6bcfcc1e465efd87367e0b1babb2c005d9cb9011ca1ffba1aefe3dab5aa9632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A31 8712 bytes

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