Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a8d811cc2fa3e8…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 21:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2ce4cf4aebbd41a9cb179a8fa2779ce7 SHA-1: 93356b77601332df63b1fe5e4c9847fe44b3dee6 SHA-256: 61a8d811cc2fa3e8ba538a2fcc1f2ad9096630e8d633c29be67455b1470b672e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to host a large number of links, characteristic of phishing or malware distribution schemes. No scripts were extracted, but the overall structure and URL distribution suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://rugerwafers.com/demo/ruger/beta/userfiles/files/militifosi.pdf In PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495f0407f38---89693666047.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142eefe8f9d4---57228637157.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/galazujupoz.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/bawilegewub.pdfIn PDF document text
    • http://annabarons.lv/files/files/vovewom.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/53037079549.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/lolinisawotezabo.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/zefizilukenasaxudojavuzu.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/guzamazezuve.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/rafonewuzumigupuzidomig.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/39315670969.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/6540694658.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/42371079709.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/68750448364.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/74606263832.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/vadawivilatovonexavubawiw.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/78295475890.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/gabowegokajupiromu.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/48200722016.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/volubogarireve.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/miluv.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/semivitupogadivatuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+android+app+for+ielts+preparationPDF 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_off0000b23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23F 10544 bytes
SHA-256: fbcd17023adb5b7697eb8ae69254fd8a4babf9a0e8f9e692fa4eeff5f045e5b3
font_01_sfnt_off0000ca65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 17092 bytes
SHA-256: bad9069647b26f3be75ecc53bd3e37ca77bbc70e84ad20fd71d6bf660c52a953