Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efbdd14f31b1982…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 02:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e5984a937543426e114a04da3c86a40 SHA-1: bcec4be8967cb9d8429c6a519b7823aaedd3a86f SHA-256: 5efbdd14f31b1982ace425f14e24f7c3182da2365f18b409606ec0b3a32b86d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which are dynamically generated, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely lead to further malicious content or phishing pages, serving as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://zajinet.ru/award?keyword=alternative+dispute+resolution+in+kenya+pdf
    • https://cdn.sqhk.co/gobajejuz/8kggnif/dusawawinamapezasozi.pdf
    • http://vizilirudigub.getenjoyment.net/how_to_speak_english_fluently_exercises.pdf
    • https://bufekebutejef.weebly.com/uploads/1/3/1/8/131856184/jebil-toxesugo-vuruwizibagew-fijaga.pdf
    • https://cdn.sqhk.co/senuziker/D4jhhgT/two_dots_key_locations_gift_workshop.pdf
    • http://tunewejewuz.mypressonline.com/leadership_styles_journal.pdf
    • https://cdn.sqhk.co/fumodolanes/jun0Jgd/zaduribozo.pdf
    • http://wivuperafuzo.mypressonline.com/the_lord_of_the_rings_the_hobbit_book_review.pdf
    • https://cdn.sqhk.co/bikegola/higgcie/portal_del_usuario_nauta_hogar.pdf
    • http://gejudoxe.mypressonline.com/ansys_apdl_welding.pdf
    • http://sevowina.medianewsonline.com/guzijuluxazojaxe.pdf
    • https://bemawupi.weebly.com/uploads/1/3/0/7/130740003/829227.pdf
    • https://cdn.sqhk.co/zesonixiv/xTuhbha/mobile_car_mechanic_near_me_cheap.pdf
    • http://gavolav.mywebcommunity.org/sebudas.pdf
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/vifusoraterera.pdf
    • https://kowalarezanir.weebly.com/uploads/1/3/1/4/131438161/c6af8dcf.pdf
    • https://dozadekexojigig.weebly.com/uploads/1/3/4/0/134096874/bexalekojo-vunegemilelama-sefudinodu.pdf
    • https://cdn.sqhk.co/bezorufuv/gjhjif8/us_tip_report_2005.pdf
    • https://cdn.sqhk.co/fewibefanid/hghfM8g/rivimefezolovej.pdf
    • https://cdn.sqhk.co/nadizolobe/WNhfjsj/backgammon_mobile_online.pdf
    • http://mumopajikex.mygamesonline.org/curso_basico_de_ingles_para_nios.pdf
    • https://cdn.sqhk.co/tatidukigag/iifGBhg/battle_ludo_game.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_992d49aa7752493d8c2eeb28581d9840.pdf?index=true
    • http://pawepeg.atwebpages.com/67826922842.pdf
    • https://2b912d1d-4511-4d15-ad79-79d4d77caf35.filesusr.com/ugd/738632_7131be04d928489ab635521831179b4d.pdf?index=true
    • http://ketabigumowun.atwebpages.com/zixowosurer.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e9.bin
845dd3c19e0fe628c7a71521deb12d3288d50fe90c20d0022bdee64896303514		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 5252 bytes
font_01_sfnt_off000107e7.bin
bff129a6e17821d43fa173afd042115d2388a945a242387b6d019604c231a600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 10728 bytes

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