Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce426c8906ee66a…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 23:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c8bb6f5c779223561f49a9ca8e256e4 SHA-1: 107aa436cf3e2119c87f3245532665acdab71864 SHA-256: cce426c8906ee66a5b0f7a1507e634ce5eeb7ebe9945923f17fa4a01d656d70f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm with numerous external URIs, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary function appears to be directing users to a large number of potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://uts.edu.co/portal/app/ckfinder/userfiles/files/70654123043.pdf In PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/berilofimu.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/6601618005.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/85523987931.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/87230705240.pdfIn PDF document text
    • https://highrise.pl/file/21249835696.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/regalipeno.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8db20f5e14f6bb15e6c92250ef425fc5/sobexidazuzemivigajoj.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/30447209443.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/xufasibodinopipelanuximi.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/44265807043.pdfIn PDF document text
    • http://rts-3.ru/upload/files/91548189272.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/jimirufasuwarorolezena.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/38920426266.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/49646688063.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feec4d5b4f---14387418826.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/18733688586.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/xirexomumidawisemaz.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/99818175484.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/24835673347.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/42980616047.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/gigadifisipem.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/54967752355.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/16646829133.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/11547984517.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/pelawijuguzaxarubako.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/nural.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=a+quiet+place+2+creaturesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 10488 bytes
SHA-256: 11b652791452e5019dd9bdd202b0f835b2ddfbd4b4aea19254e94321d7ce4984
font_01_sfnt_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 17568 bytes
SHA-256: 1435ef443aa7ba197a9db40abfa36a4b53fff16dc1407718b2e41b08375138df
font_02_sfnt_off0001365f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1