Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ac390b3572eb1d…

MALICIOUS

PDF

38.1 KB Created: 2020-04-16 14:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 22c72bb51217c4e6e1a4b98f22032b8a SHA-1: e8a20d916a3c8f75eccc3a80ed0cb7ab616bc78c SHA-256: 74ac390b3572eb1d974933eb5dedc9826b9557297f6393942990b3067e7c7ee1
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to similarly structured PDF files on different domains, indicating a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains a URL that appears to be a lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

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://rwpdivephotography.com/uploads/1/3/0/6/130604769/130604769.html#jupiter+fact+sheet+nasa
    • http://mhcsltd.org/uploads/1/3/1/4/131437859/namajoxarajesosoni.pdf
    • http://psy-sur-paris.com/uploads/1/3/1/4/131454255/1575098.pdf
    • http://saluynutriciogirona.com/uploads/1/3/0/6/130621191/lufirefob_voduzerikowapun_jazepumeg_zomoxutom.pdf
    • http://asknoonan.com/uploads/1/3/1/3/131383671/9af4b4a8.pdf
    • http://paneltechhomes.org/uploads/1/3/1/4/131437268/6bcd6a44cfd0b66.pdf
    • http://pratt.engineer/uploads/1/3/1/6/131636744/vijuvim.pdf
    • http://healdsburgflorist.com/uploads/1/3/0/5/130588867/libuwiw-serikotiw.pdf
    • http://tolivehealthy4life.org/uploads/1/3/1/4/131410007/c6eaa89ee23c89.pdf
    • http://wedoitallinstallationllc.com/uploads/1/3/0/7/130775383/33da5829392e.pdf
    • http://stumpgrinderscolorado.com/uploads/1/3/0/7/130739751/fumorewot-pigukos-sojukotidu-kigifinajelu.pdf
    • http://djtaylorshopuk.com/uploads/1/3/0/6/130639624/fujolejep.pdf
    • http://2018lawyeringforchange.com/uploads/1/3/1/4/131407042/guwamuruf.pdf
    • http://b2excavatingllc.com/uploads/1/3/0/6/130622048/3990bda80.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_off00006b07.bin
fa9888cba981ef92cc543c1dd50959fcb0df10d8c0570063e3550a8594ff2b44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B07 8148 bytes

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