Malicious PDF — malware analysis report

Static analysis result for SHA-256 8678127497526787…

MALICIOUS

PDF

83.1 KB Created: 2021-10-06 02:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 53d474d4525523bc9e7d77e5eaff8e8e SHA-1: 8be6261b6309937f5e4c7a1e4e463dfd19eadcf3 SHA-256: 8678127497526787ab4caf60fab901bff35751b0d5977ed5dedbddb61b6dbcff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ketchas.ru/uplcv?utm_term=march+17+cusp PDF link annotation
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/xifoxa.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/kakujizababo.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/rufonu.pdfIn PDF document text
    • https://rintrans.com/files/43840742399.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/99016593273.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/vexulepiwokodiwazi.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/88728a358499eba7b229c5bc1f984a21/garofimikasoxenenukan.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/mikokeparorar.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/todalarojusegagujuxupa.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/5091553532.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/6801408652.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/93769327926.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/fetebidikeduripuzunow.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/14203494177.pdfIn PDF document text
    • https://rodotour.com/userfiles/file/47263948453.pdfIn PDF document text
    • https://energooptima.hu/upload/File/61375491377.pdfIn PDF document text
    • https://businesslife.com/content/file/xogamozevizapasolo.pdfIn PDF document text
    • http://eternaseguros.net/files/files/poleduvilanemirisumak.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/34469525746.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/26750640691.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/jigaxanenumijaxafosoni.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/lunuxodu.pdfIn PDF document text
    • http://sinners-party.de/media/file/jexik.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/sabowevofomirogevokepi.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/40850745117.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_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 10076 bytes
SHA-256: 31f3df32df655cf7ff8124fbca9b9fe014275ceeeede094117c7fc081dc054e3
font_01_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 18876 bytes
SHA-256: 864abd0a046681b839319c6537ca096d72e9cebaf211f630b17b7e8f9c7954d5
font_02_sfnt_off00012679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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