Malicious PDF — malware analysis report

Static analysis result for SHA-256 031e8f8021255215…

MALICIOUS

PDF

33.2 KB Created: 2020-05-17 00:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ed9f2cfc046f801cf5d58097a78cd6 SHA-1: e3f02a0a6d54e6e2adb1d4be17574d65bc3c36db SHA-256: 031e8f802125521557efe7ea6115b6ec7210b75a4300fa6b8faa0ab11fbd207b
116 Risk Score

Malware Insights

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

The PDF is identified as a malicious lure due to its small size, image-only content, and embedded action trigger. It contains a large number of external links, primarily pointing to other PDFs hosted on various domains, suggesting a link farm or redirection scheme. The primary URL, http://drchriskusek.com/uploads/1/3/0/4/130435848/130435848.html#forcetriad+user+guide, likely serves as the initial entry point for this chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 33 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://drchriskusek.com/uploads/1/3/0/4/130435848/130435848.html#forcetriad+user+guide
    • http://vf2018webbly.com/uploads/1/3/1/4/131437637/wojuxowiru.pdf
    • http://teachtofly.com/uploads/1/3/0/6/130639335/fidigegagonurav.pdf
    • http://rltformyhorse.com/uploads/1/3/0/4/130436006/gelarejomexipo.pdf
    • http://southcoastsporthorses.com/uploads/1/3/1/6/131606144/xotefitevane-wesezezimud-bimuremud.pdf
    • http://inmanenergy.com/uploads/1/3/0/2/130287454/pevamowes.pdf
    • http://iotwstudio.org/uploads/1/3/1/4/131407057/solaxotizak-zijeva.pdf
    • http://dirtyburdz.com/uploads/1/3/0/4/130477448/0aea67331f726.pdf
    • http://financementgeneral.com/uploads/1/3/1/4/131438129/lulibozuso_wufunijige_tagiz_rixotiv.pdf
    • http://dukeshealth.com/uploads/1/3/1/4/131408086/ridanevizovuj-jadutiwufozigan-sovuna.pdf
    • http://rnsbpo.com/uploads/1/3/0/6/130621060/af459b92a.pdf
    • http://fountainoflifesupportservices.org/uploads/1/3/1/3/131380470/zawon_xuledemododi.pdf
    • http://kiranalangjaya.com/uploads/1/3/0/6/130620989/4484558e.pdf
    • http://phillytown76.com/uploads/1/3/0/5/130589391/5814843.pdf
    • http://commonwealthcouncil.org/uploads/1/3/0/3/130379367/5200082.pdf
    • http://capitalareaanesthia.com/uploads/1/3/0/7/130739597/wovugenawemaxurepij.pdf
    • http://massageandyogawithlisa.com/uploads/1/3/0/6/130639205/popodamezatav.pdf
    • http://atasindustries7.com/uploads/1/3/0/6/130620401/a94337e.pdf
    • http://anovabh.com/uploads/1/3/1/4/131453522/01e81b.pdf
    • http://aurealashesandbrows.com/uploads/1/3/0/9/130969440/3457771.pdf
    • http://groene-zorg.nl/uploads/1/3/1/4/131407155/e02db96b.pdf
    • http://krmgdr.com/uploads/1/3/0/6/130604359/4287875.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00005e22.bin
d0b08bdc83febc253bdca8d956c96932ba4854577267d0c8bb9fc4a45eecd136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E22 7948 bytes

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