Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d343f621b3016e7…

MALICIOUS

PDF

36.6 KB Created: 2020-03-29 09:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25834418d9fa981f83464e9928b8ad11 SHA-1: 71d4b469a32a73428ef270e4f71a8ac63700f052 SHA-256: 9d343f621b3016e79bf30fe6cf0aec1e3b76abcee877f23d72b52e3296f2a3f4
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of SEO poisoning or a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier strongly supports the malicious nature of this document.

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://slaten-wedding.rominastiebenphotography.com/uploads/1/3/0/5/130589373/130589373.html#palabras+con+la+letra+tl+y+su+significado
    • http://xmo1.com/uploads/1/3/0/5/130589031/gogusaz-sonobowekegusuf.pdf
    • http://career-escape-program.surpassyourdreams.com/uploads/1/3/0/5/130551457/83287632.pdf
    • http://taranakitimebank.nz/uploads/1/3/0/7/130738722/goduvaxila.pdf
    • http://renesugar.com/uploads/1/3/0/7/130776898/c52a253a02.pdf
    • http://laurengarciaphotography.com/uploads/1/3/0/6/130639199/2019115.pdf
    • http://www.paitmencomp.com/uploads/1/3/0/5/130588944/7305399.pdf
    • http://rbilivingwell.com/uploads/1/3/0/2/130270985/e4eb45d45ac7cc4.pdf
    • http://goodlifegardens.co.nz/uploads/1/3/0/9/130969511/ledimagazelejofurap.pdf
    • http://aurorapropaintingservices.com/uploads/1/3/1/3/131382148/b56ad21.pdf
    • http://www.sacredpeaceministries.com/uploads/1/3/0/5/130590432/bigufepusubuvot.pdf
    • http://futbol-tips.com/uploads/1/3/0/6/130605349/1545223.pdf
    • http://alpinecbd.co/uploads/1/3/0/3/130313368/9391902.pdf
    • http://hostmaster.hydeheathpreschool.org.uk/uploads/1/3/0/7/130740087/7442103.pdf
    • http://24hourtruckrvtrailerbusesrepair.com/uploads/1/3/0/8/130874614/goguva.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_off0000680d.bin
f7ca76520800310efe6761a0d826e77dbe903f37418d70ac16b70ae575dfa2dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680D 7352 bytes

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