Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6391be17bdf9df5…

MALICIOUS

PDF

44.6 KB Created: 2020-03-31 22:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ae3ca606cfc9e203c365e5cfcccbbf39 SHA-1: 709b4ed2b5c39a91e7778ebd416a9ac52dc3157a SHA-256: b6391be17bdf9df5cd494be810f890ffd1ba8e7f6fd7cc6d4f1317cc1d5af2c0
92 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files hosted on similar domains. The document body, though partially corrupted, contains a title related to statistical examples and mentions wkhtmltopdf, suggesting it's a lure. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, likely designed to distribute malicious content or engage in SEO abuse. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://mrsjcowhy.com/uploads/1/3/0/5/130551619/130551619.html#correlacion+de+spearman+ejemplos+resueltos
    • http://kristendellapace.com/uploads/1/3/0/6/130621545/d076e.pdf
    • http://discountwiresupply.com/uploads/1/3/0/7/130775251/098bd721b0.pdf
    • http://dearbestie.com/uploads/1/3/0/6/130604731/4b6ee5494.pdf
    • http://unioncountydrugattorney.com/uploads/1/3/0/6/130639180/9b9ed0ec5.pdf
    • http://ankodn.com/uploads/1/3/0/2/130271004/b44b70ba8e0ad0.pdf
    • http://3siinc.net/uploads/1/3/0/5/130590637/c74b1.pdf
    • http://mynorahaze.com/uploads/1/3/0/2/130289418/zupig_dejizakibanagof_xakavejumuke.pdf
    • http://urchig.com/uploads/1/3/0/3/130323106/8464f913e2f07a.pdf
    • http://mycareercoaches.org/uploads/1/3/1/0/131070237/10e13a.pdf
    • http://fryshusetbasket.com/uploads/1/3/0/5/130550772/vanubizavodi-widinazofizefop-nigelep-nobivogodakat.pdf
    • http://svsm.nl/uploads/1/3/1/4/131407736/7153806.pdf
    • http://icremeria.com/uploads/1/3/0/5/130539269/e73dde020.pdf
    • http://fitcoachuniversity.com/uploads/1/3/0/7/130776791/62c63619.pdf
    • http://lakotallc.com/uploads/1/3/0/5/130539935/tolijisufubojed.pdf
    • http://fakeangels.space/uploads/1/3/0/3/130323286/6128884.pdf
    • http://tjsfiercefitness.com/uploads/1/3/0/6/130639228/zixutabevol.pdf
    • http://nettletonband.com/uploads/1/3/1/3/131384173/vubirorukox-daperibugu-vinimu-fidufubema.pdf
    • http://umadevimohan.com/uploads/1/3/0/5/130550980/dizaduz.pdf
    • http://myacec.com/uploads/1/3/0/6/130604283/24c5bb.pdf
    • http://webdisk.pantoqi.co.za/uploads/1/3/0/7/130740502/pavexugakoja.pdf
    • http://bendubuque.com/uploads/1/3/0/7/130775174/selokexi_xuxugidip_xawelog.pdf
    • http://luxuryproducts.us/uploads/1/3/0/8/130874314/xanujumizipuginug.pdf
    • http://marketingconsumerbehaviorblog2.com/uploads/1/3/1/3/131379550/8052204.pdf
    • http://sweetexpressions4you.com/uploads/1/3/0/7/130740412/8100301.pdf
    • http://a-abc.xyz/uploads/1/3/0/6/130639249/tovisewotig-vavusekatuvuzi.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_off000077e2.bin
c90ba648c4dd57c701defbe1ba9899e68e8c3251eb50ee55adb2fbdeee573b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E2 8856 bytes
font_01_sfnt_off00009865.bin
9f5082701ede3b34412025578f3613d16372f7e661c8785cd8d7b7f4cdd3c0ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9865 2800 bytes

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