Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd22d96a2d8fbbfc…

MALICIOUS

PDF

67.3 KB Created: 2021-09-28 10:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9163cf0a149aeb015afd623e0e69c5ae SHA-1: 70c4bc21c5159a9b7ecb169806fba0e0c00c5c7e SHA-256: dd22d96a2d8fbbfc7ca3cec518adf2ed65cf95c095f36ebc3cd2acdeced79766
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing an image-based design to conceal clickable links. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially malicious domains, strongly suggests an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection further corroborate its malicious nature, likely serving as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161353790c4488---87905947990.pdf In PDF document text
    • http://centreforeffectivecoaching.com/media/file/91256968127.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xixavafitokisuwez.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/xuvobafitagim.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/86440453344.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/8489417903.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/28358261773.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161306585302cf---lazagupuwe.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/zozagesuzo.pdfIn PDF document text
    • https://buka.ru/sadm_files/29519967541.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/74722728360.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/66514300344.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/72666624103.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/26671179074.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/83061701345.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/baxunatelojomuwafukavi.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/11442247832.pdfIn PDF document text
    • https://tworaise.com/userfiles/file/pidasuxisogesuzen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mod+apk+of+worms+zonePDF link annotation
    • http://elezioni2014.gds.it/userfiles/file/nijunagilug.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_off0000ac47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45E 10656 bytes
SHA-256: 3a6bb78735a75961ee85845975558137034af61b732fa63c0e0d44533daaf9f7
font_02_sfnt_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 14080 bytes
SHA-256: f980a29d481ff807711ca7f84ab03362c995537527f23bafbebaef9d99eb3001

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