Malicious PDF — malware analysis report

Static analysis result for SHA-256 493a22fdbf2fc9f4…

MALICIOUS

PDF

67.9 KB Created: 2021-03-05 06:13:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e20632bce7d838ae292b6a0ee648a6d9 SHA-1: 9239517183792aaf19e0ee610124906a25b71326 SHA-256: 493a22fdbf2fc9f46811259b9236e4efefcb72b440d165671d90756deac9cf1f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, a common tactic for SEO manipulation or distributing malicious content. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a large number of links, some hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8382

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://vilenefex.ru/award?keyword=national+competency+based+teacher+standards+7+domain PDF link annotation
    • https://cdn.sqhk.co/tavevalurov/7kjh3zJ/riliwapogalonuwew.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/nurasug.pdfIn PDF document text
    • https://munijames.weebly.com/uploads/1/3/2/8/132814228/5921869.pdfIn PDF document text
    • https://cdn.sqhk.co/najiligopej/pjiXgjh/bejezonubazopubinaf.pdfIn PDF document text
    • https://sokexeziboril.weebly.com/uploads/1/3/4/9/134902232/jekabetetebe.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/eigPxhh/tachyon_technologies_revenue.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/3848807.pdfIn PDF document text
    • http://wurogutevifo.iblogger.org/new_ps2_emulator_for_android_2018.pdfIn PDF document text
    • https://xinozujo.weebly.com/uploads/1/3/0/8/130874257/b96a744a0a8.pdfIn PDF document text
    • http://wutulesarox.iblogger.org/licensed_aircraft_maintenance_engineer_cv.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/Wqga9hi/lebebage.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/detisapu_koxovawo.pdfIn PDF document text
    • https://cdn.sqhk.co/bonipumijed/jdgcgjE/jungle_run_2_game.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/jojutaposijulolatarazekaz.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_7e75959de8684262b0f1764dc92a3aa8.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_5e4fd75693544bec839a22e6032881a4.pdf?index=trueIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_96bceb1b4ebc4898bd6f7eb925a578d2.pdf?index=trueIn PDF document text
    • http://livijakowoleb.rf.gd/how_do_you_make_cajun_shrimp_pasta.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/poe_pastebin_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/ravodof.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 1644 bytes
SHA-256: 1e8a8a0fa1f092d070f3d135f95cfe16f87eb5a8708dd3712317bebb8096d10c

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