Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d52021e2036c0a…

MALICIOUS

PDF

44.7 KB Created: 2020-03-16 14:55:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0e7fc58d5efb1a7375bf14600fc26d13 SHA-1: 67e2e82d18265859ef35aaee1c60422590780c9c SHA-256: 51d52021e2036c0af8d2865ba59bbb4ed3eb4287cc615a058a32cf6225fe9e97
94 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, many of which are numerically or generically named, suggesting an SEO link farm. The document body, though partially corrupted, contains a URL related to printer setup, which is likely a lure. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. No scripts were extracted from this sample.

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://4wys0r.bdgct.com/uploads/1/3/0/2/130287895/130287895.html#how+to+scan+with+hp+officejet+4500+wireless+printer
    • http://mercyscleaningservices.com/uploads/1/3/0/5/130546742/fa02d90.pdf
    • http://entreletrasycafe.com/uploads/1/3/0/6/130604962/5831020.pdf
    • http://imagecathedral.net/uploads/1/3/1/0/131070590/1686704.pdf
    • http://admin.jakdempseydesign.co.uk/uploads/1/3/0/6/130603873/8800512.pdf
    • http://www.medschoolroadmap.co.uk/uploads/1/3/0/6/130639632/7251581.pdf
    • http://theshabbyduckling.com/uploads/1/3/0/2/130271217/92f54f270.pdf
    • http://cpanel.lacrescentareaeventcenter.org/uploads/1/3/0/8/130873784/1530174.pdf
    • http://photosbygayle.info/uploads/1/3/0/6/130604860/38fe22a89b1.pdf
    • http://sherifnasser.com/uploads/1/3/0/9/130969143/purinig_jilabuzitaz_fegupekukerawig_bugukimovuz.pdf
    • http://cadescovejunkies.com/uploads/1/3/0/6/130621706/wulifuz.pdf
    • http://stagonys.com/uploads/1/3/0/5/130588297/pebezemijo.pdf
    • http://mail.chartreuxcat.net/uploads/1/3/0/2/130291783/2141736.pdf
    • http://matronitapress.com/uploads/1/3/0/4/130477048/mufotebes-vefuzexoz.pdf
    • http://suwanneeprincess.com/uploads/1/3/0/7/130739011/2321086.pdf
    • http://compinyfingerboards.com/uploads/1/3/0/2/130289658/e5a8eb8a4c2.pdf
    • http://webdisk.digcitkids.com/uploads/1/3/0/3/130379058/a916a2a0064410d.pdf
    • http://www.thesanctuaryofcapecod.com/uploads/1/3/0/8/130874104/gexajenupasado-lesuxowoz.pdf
    • http://invisionss.com/uploads/1/3/0/3/130313429/jenado.pdf
    • http://sb-global.net/uploads/1/3/0/6/130620997/mugewamirotev.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007005.bin
5d36cd3e5ca27e0edfe7ec9858172a787b96806deda3fcc08bc48ef283f5f5c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7005 8272 bytes
font_01_sfnt_off00009016.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9016 16036 bytes

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