Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2a662e1042aa76…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 15:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 41e2addd130d88ea3f8cae0122665661 SHA-1: 585be912d0b57c8045b8ca916bf3d55291bad445 SHA-256: 8d2a662e1042aa76fad042ea96120694018134bdfbdd36d6a7b602b65f15dc22
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and numerous external links, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript and extensive link farm suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crewmak.ru/uplcv?utm_term=how+to+hack+someone%27s+snap+2021 PDF link annotation
    • https://deitratech.com/userfiles/file/38232829564.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/15962550115.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/67917259429.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/57067976607.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/nimemiputaxizise.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/warogagosaro.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/26075182887.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c860e4cb---defekorajiladidopi.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/tilidivinagoxovi.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/61826876199.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/27829409752.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/sefaputida.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/fizujom.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/ganedojov.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/37446486871.pdfIn PDF document text
    • https://begili.com/uploads/image/files/94762325143.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/gisidelasuzux.pdfIn PDF document text
    • http://synphabase.ch/upload/file/boketoxesixijojumunafifo.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f57f8b1f09f0bd1ea0f02a0823803738/90874100136.pdfIn PDF document text
    • https://schmitz.cz/res/file/xitabudow.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/wopaliloju.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/kozezefovinip.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/85672556823.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/dujovuravedusafolipob.pdfIn PDF document text
    • 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_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 10896 bytes
SHA-256: f118d537e369630029d1bcb5356e5f3681a4af52b58d4d6637fb6ab5bcb13fbf
font_02_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 18076 bytes
SHA-256: 55baafcc94d0339960e7545d3ac4e198a1e7cf544f36efd95edac1c3db7d325a

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