Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b341e689847136…

MALICIOUS

PDF

70.5 KB Created: 2021-09-11 03:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0f17cf884296b187be125d4c53941e6 SHA-1: bf897935910c5fd412a7d94bbf55fed0930f0216 SHA-256: d4b341e689847136ae7fa4b8304e74f1b38e3e7c8882a70e81312255dc6a53fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spam campaign aiming to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ansing.nl/userfiles/file/mutizadizile.pdf In PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/6512024235.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/66826445184.pdfIn PDF document text
    • https://manenshop.com/upload/files/84323381438.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/teges.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b78b16a27f---relatemobomiwakevuxin.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/wetajaxisezeb.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/65754795780.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/83175871647.pdfIn PDF document text
    • http://screen.by/images/file/10778749530.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109110756519127.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/56811672297.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/zebetazeputeruwejugiguz.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/finobite.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/tozibe.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/livegumidaxazag.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/zutudapexovuge.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcec172dad---mefesotopawuxit.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/70196315486.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/fijisabuvurixinis.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/83029665941.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/xorasanefijipifalowuvefir.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/nesozido.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/nunesisemujimofepolebiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ip+webcam+home+security+cameraPDF 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_off0000b350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB350 15872 bytes
SHA-256: b29a76b57ba98ed08a146707a7b7933134e8beff5bd6452547cdcb21879df89d
font_01_sfnt_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 10880 bytes
SHA-256: 576a7c94de14f3a912467f62943eb5c6cf7408ba12e4bfb1b68972557b89145b

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