Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e9c9bcc6396e84…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 06:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2718b8c90193d674ce8b6e357615a45 SHA-1: f1daf9c9a77f4cd0247cbcba38ac310ba178fbc6 SHA-256: 53e9c9bcc6396e84d0e9585c763167959fcc155ebb10bd65fd64e68fe71555b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. 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 0.9973

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://infrive.ru/uplcv?utm_term=if+you+forgot+your+password+on+your+phone+how+do+you+unlock+it PDF link annotation
    • https://invest.pl/userfiles/file/31045858111.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/kubekujozulikitimixefi.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/jibebiperonikage.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/24581637008.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/54870105500.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/somagebegasoruzewusu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614319361249f---19278085814.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/kapuduwugugadoredutuf.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/69229318343.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/tomifagerunojusagusapotad.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/79128059591.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/xozubamativujakor.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/wujij.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/15681097334.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/moxekasowu.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/katutarotufadubanomodeneb.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/91314674944.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/69955363392.pdfIn PDF document text
    • https://netlandschool.cl/files/35724762514.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/92521716748.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210913085814_ianuvs.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_off0000adb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB8 17300 bytes
SHA-256: 5bdecb86e0975f3e7510fbbf42c6460ba8d9bde4958986c81a206e6b1fb0cb4a
font_01_sfnt_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 11244 bytes
SHA-256: 3bba5875495240055d685ef6d326ac7937214ce44e0a7787ed2ffda40ece34ec
font_02_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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