Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bd41c830a3e4df…

MALICIOUS

PDF

48.2 KB Created: 2020-03-10 05:26:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 22d2c401b187be9b0534af46d04f5046 SHA-1: bdf81d97d5072512cfd007b8ebe6653cb680b015 SHA-256: 93bd41c830a3e4df90a96eae64e7c3cddb1b2bebca866aa9f8e7be09c63630ba
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm designed to manipulate search engine rankings or distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a delivery mechanism for further malware or phishing content. No scripts were extracted, and the document body was largely unreadable, but the heuristic firings clearly point to a link-farming attack pattern.

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://host43.carmichaelnl.com/uploads/1/3/0/8/130874410/130874410.html#aioli+menu+trinidad
    • http://woahband.com/uploads/1/3/0/7/130774962/5055327.pdf
    • http://carpetcleanerwaukesha.com/uploads/1/3/0/6/130620184/8374854.pdf
    • http://uinivest.com/uploads/1/3/0/7/130739633/mukigakogotalap.pdf
    • http://scmfevents.org/uploads/1/3/0/6/130639814/3cb7c05c9625.pdf
    • http://mrsboucher.com/uploads/1/3/0/5/130551477/lemafolesesufez.pdf
    • http://www.airfishy.com/uploads/1/3/0/2/130270911/raxulasig.pdf
    • http://erlinsetups.com/uploads/1/3/0/5/130539416/nusoxod.pdf
    • http://helpusinhaiti.com/uploads/1/3/0/6/130621089/fedowedega.pdf
    • http://carsncoffeecafe.com/uploads/1/3/0/3/130313152/xopegebamo_xiwedigunaxuwe_xumijuber.pdf
    • http://meridianscan.com/uploads/1/3/0/3/130324063/zaxidir-rosamumig-zefigux.pdf
    • http://masstechlaw.net/uploads/1/3/0/8/130874647/7678883.pdf
    • http://www.ikenstem.com/uploads/1/3/0/6/130605111/tunuxa.pdf
    • http://bvillejudge.com/uploads/1/3/0/4/130483862/deb4d5ec.pdf
    • http://hostmaster.biophilicdesign.net/uploads/1/3/0/2/130289063/5404585.pdf
    • http://seneleygreenparishcouncil.com/uploads/1/3/0/5/130551788/81dcd3f4.pdf
    • http://centerofsacredpassage.com/uploads/1/3/0/7/130739443/kotoxubop-rajevemomokij.pdf
    • http://joycejudyfororegon.com/uploads/1/3/0/7/130739864/dejur.pdf
    • http://gianfortefacts.com/uploads/1/3/0/6/130640190/6566350.pdf
    • http://eternity-games.com/uploads/1/3/0/7/130739472/1130277.pdf
    • http://callorinfo.com/uploads/1/3/0/4/130490221/3790323.pdf
    • http://millsdigital.com/uploads/1/3/0/4/130488295/648771.pdf
    • http://comeseemyjamaica.com/uploads/1/3/0/7/130739443/123a94719031a.pdf
    • http://scentedpens.com/uploads/1/3/0/6/130603955/tuvefuz.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_off00008357.bin
b3664e74de50058b4af44400b1e755a1f8f3b84ec65138e4ab322a5e768b181d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8357 10060 bytes
font_01_sfnt_off0000a7ec.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7EC 2652 bytes

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