Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23933d2773a0116…

MALICIOUS

PDF

36.9 KB Created: 2020-03-07 20:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e1f0e36828702d15f0f733065739b213 SHA-1: f23529a70407b73abf4a0c0591d7a60aa9aba2aa SHA-256: e23933d2773a0116d6b3124914497570578519c2d94b2cdd21478ac35da69fff
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The document body text is obfuscated but appears to contain a title related to 'second language acquisition' and references to wkhtmltopdf, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate a link farm strategy. The primary intent appears to be directing users to a network of external sites, likely for SEO manipulation or to host further malicious content.

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://kohno-corp.com/uploads/1/3/0/7/130776321/130776321.html#definition+of+output+in+second+language+acquisition
    • http://www.affordabletax4you.com/uploads/1/3/0/7/130775355/momedopeluno_tamebefobex.pdf
    • http://newmiltoneagles.org.uk/uploads/1/3/0/7/130775953/rezesuxa.pdf
    • http://www.pureandsimplecleaning.co.uk/uploads/1/3/0/6/130604129/zolawonulojos.pdf
    • http://arianagibbard.com/uploads/1/3/0/3/130379126/xowizedaridunir_sazepifuxukileb_xorigijibadam.pdf
    • http://englishtheory.com/uploads/1/3/0/6/130620607/lejowanulobi_zivutaw_wiwanonozezo_menete.pdf
    • http://zenlockyt.com/uploads/1/3/0/5/130550762/kowagawalo-lebome-xenojesapokok-sumopug.pdf
    • http://nakshatrasadvancedcourse.com/uploads/1/3/0/2/130272582/6551328.pdf
    • http://selkirkoutfitting.com/uploads/1/3/0/5/130589281/xasabejevumizupenob.pdf
    • http://cothrons.net/uploads/1/3/0/7/130739826/merovexusavixo-bezagojaduxexi.pdf
    • http://onthisaugustday.com/uploads/1/3/0/6/130622011/27658aa.pdf
    • http://wiseheartmindfulness.maryhigginswebdesign.com/uploads/1/3/0/5/130590435/9331035.pdf
    • http://www.boeterenteberekenen.com/uploads/1/3/0/4/130436078/4698287.pdf
    • http://crystalgolfresorts.com/uploads/1/3/0/6/130604701/kojidofagoboxow.pdf
    • http://dillettfamily.org/uploads/1/3/0/2/130270843/b6b9f.pdf
    • http://wifebirthdaygiftideas.com/uploads/1/3/0/2/130271195/musadivoxijel.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_off00006973.bin
37929e6eb6494e7c57cf84df4e575a11f95b3682b60547c3922d7f91fd712806		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6973 7296 bytes

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