Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d82796ae63cf97…

MALICIOUS

PDF

35.4 KB Created: 2020-06-07 16:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 207f36a9770c9fb9cadd8d994bb345a2 SHA-1: 3810a595026e93d1575a838cee86c34b8ee7ba4a SHA-256: 64d82796ae63cf974be4c6780da5716d245e6688997cc205d5ff04933559cc9b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm. No scripts were extracted, but the presence of numerous external links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://qxdte.slpny.com/uploads/1/3/0/7/130776726/130776726.html#ejercicios+matematicos+para+ni%25C3%25B1os+de
    • http://jcresidentialcda.com/uploads/1/3/1/4/131406717/3910321.pdf
    • http://benibara.club/uploads/1/3/0/6/130639396/3869132.pdf
    • http://fullpintco.com/uploads/1/3/1/6/131637291/c3d0bdfa.pdf
    • http://cpanel.0cycle.com/uploads/1/3/1/6/131637037/6201556.pdf
    • http://ns2.arcasdesigns.com/uploads/1/3/0/4/130488114/wonarolujoxomozufuge.pdf
    • http://skinrxlaserstudio.com/uploads/1/3/0/5/130589216/retikumibibobaga.pdf
    • http://whiskmeawaybakerycle.com/uploads/1/3/0/7/130738680/lusoxag-fobabikimejiva.pdf
    • http://alicornapothecary.com/uploads/1/3/0/5/130539341/lizisufiv.pdf
    • http://autodiscover.kettlecoveicecream.com/uploads/1/3/1/4/131437623/9f0001ee0a.pdf
    • http://heartlandapparel.org/uploads/1/3/0/5/130551770/pisaxusar_gisixazituzep_nagomukiduro.pdf
    • http://iselfrescue.com/uploads/1/3/0/6/130604537/5826368.pdf
    • http://dewiedits.co.uk/uploads/1/3/0/8/130813524/6b4d9ce50d7e49.pdf
    • http://collectivevisionsolutions.com/uploads/1/3/1/6/131606057/c5785b8bbd5ebc0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jazinap566325878.files.wordpress.com/2020/06/58806250330.pdf
    • https://jejiwivu.files.wordpress.com/2020/06/17835172017.pdf
    • https://pidinapi.files.wordpress.com/2020/06/85702320974.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c81.bin
767df3abcfe1f58b6497ce0f1d662fa6b7a294afcf38ab0f7b7f3c58d03e2abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C81 10928 bytes

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