Malicious PDF — malware analysis report

Static analysis result for SHA-256 773bf1b0857ac0f5…

MALICIOUS

PDF

54.5 KB Created: 2020-03-31 12:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8bbac163896025df2ec4a0cea7e2635e SHA-1: 84377168d0be0d48c15856e67f3d23fdb6b24d71 SHA-256: 773bf1b0857ac0f585780ee95ac865d85784ac21bbadf29db61e820a3db058f7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to other PDF files on various domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be directing users to a network of sites, potentially for SEO manipulation or to serve as a distribution point for 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://dancinggoatsanctuary.com/uploads/1/3/0/4/130483454/130483454.html#lim+1-cos%5E2+2x%2Fx+sin+2x
    • http://lylaminxvip.com/uploads/1/3/0/5/130589261/5940880.pdf
    • http://mail.saicsf.org/uploads/1/3/0/6/130604958/denuka.pdf
    • http://bluemessinia.gr/uploads/1/3/0/4/130490078/paxobabeladidu.pdf
    • http://dealershipresultsgroupllc.com/uploads/1/3/0/5/130590357/f898cddc26.pdf
    • http://racedaycondos.com/uploads/1/3/0/4/130483389/8811031.pdf
    • http://hannahubl.com/uploads/1/3/0/4/130477719/tigorata.pdf
    • http://shopcaiasboutique.com/uploads/1/3/0/5/130588489/bovifofazuzox-kuxase-vafeb.pdf
    • http://thecreepingmoon.com/uploads/1/3/0/5/130590548/9829998.pdf
    • http://bostonexecutiveassistants.com/uploads/1/3/0/6/130639124/2d07b3b872d6d0a.pdf
    • http://albacoresupplies.com/uploads/1/3/1/0/131070618/mamezozesapeliwano.pdf
    • http://mhpowellartist.com/uploads/1/3/1/0/131070979/kozidap_lekekobezop.pdf
    • http://birchmanland.com/uploads/1/3/0/5/130543462/pupedefasose.pdf
    • http://networkinginhighheels.com/uploads/1/3/1/4/131438442/782c7f.pdf
    • http://alquilerconstrutu.com/uploads/1/3/1/4/131406758/bee697816c38.pdf
    • http://joyrideonline.com/uploads/1/3/0/8/130813601/7974186.pdf
    • http://90fairdrive.com/uploads/1/3/1/4/131438899/pefililabekel.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ac7.bin
7dcea53177936094008ce452f572a87fd01648688c55477d4a3309cef343d472		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC7 9200 bytes
font_01_sfnt_off0000ae14.bin
7863b829de04ea8b7f5be4d5dae43fa62182e7611f0c3a300d10b316d27db496		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE14 2732 bytes
font_02_sfnt_off0000b7c4.bin
cdfcec7897a1c94de9a5050e27ddc770a5126b403ca5c5b32d86f2269ecff58d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C4 16036 bytes

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