Malicious PDF — malware analysis report

Static analysis result for SHA-256 3379c4f917fdd593…

MALICIOUS

PDF

45.4 KB Created: 2020-04-09 04:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e711eff7822b24362ab17d3763d8d200 SHA-1: a51160de19eedf09138d88ad783771db99d49e79 SHA-256: 3379c4f917fdd593ce935f7ed1f049f7dee9622679a4f110476a27059b531761
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, a technique often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly indicated maliciousness. The primary attack pattern observed is the creation of a link farm, directing users to various PDF documents hosted on different domains. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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://getmindmate.com/uploads/1/3/1/3/131380845/131380845.html#mecanismos+de+defensa+psicologia+sublimacion
    • http://maryanneconner.com/uploads/1/3/0/2/130287989/mixifa.pdf
    • http://thebuddhasutra.com/uploads/1/3/1/0/131069961/biluxaf.pdf
    • http://testimonium.net/uploads/1/3/1/1/131164136/14469b1edd2ba.pdf
    • http://heavenlycitizenship.com/uploads/1/3/1/3/131379503/9410396.pdf
    • http://cascadeladyhoops.com/uploads/1/3/0/6/130640198/4bda76ad56f.pdf
    • http://steamworksscranton.org/uploads/1/3/0/8/130874389/9f61acf.pdf
    • http://cordimarian.org/uploads/1/3/0/5/130540240/e6d2cb3.pdf
    • http://sportsdicesim.com/uploads/1/3/0/8/130814588/luvumimenep.pdf
    • http://xotikka.net/uploads/1/3/1/4/131437145/nuwulikejotibu-zujawopova-rurowetevo-fitafo.pdf
    • http://theheartdiseasediva.com/uploads/1/3/1/3/131383297/53857.pdf
    • http://indelibleconscious.org/uploads/1/3/0/6/130621005/6391277.pdf
    • http://gabbard-cornell.com/uploads/1/3/1/3/131398539/beguvej_sawamarijoxowa.pdf
    • http://sgfuniqueboutique.com/uploads/1/3/0/4/130488734/9767690.pdf
    • http://annarbormothertree.com/uploads/1/3/0/3/130313013/7254980.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_off00008752.bin
2dfcf6f68628ff4708be49b78c91f6e4dfb8882cde2dc797fd32d5feb753a442		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8752 8492 bytes

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