Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39a994b17a69760…

MALICIOUS

PDF

85.2 KB Created: 2021-09-22 13:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f155c0a49ff1545a428c5feedbe6bb51 SHA-1: 283560abbd185fa306e400fefe11e88ab85b5ea6 SHA-256: d39a994b17a6976020c16f7620b02c35deb5cf5b5be03fb1bd442ec44882f297
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous external URIs and is structured as a link farm, indicating an intent to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's used to facilitate initial access, likely via spearphishing, to lead users to compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=apps+shortcut+android PDF link annotation
    • http://bluestandard.pl/ckfinder/userfiles/files/lowusemug.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/tisalejanijizuwilapaxabi.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/gukaguvijalutorajena.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/65550771147.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/bafewujo.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/47696900822.pdfIn PDF document text
    • http://sunway.me/uploads/file/101210418723.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2126c9231---64570500152.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/22076163221.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/tuzajotur.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/55985350727.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/nodatesunopareweda.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/sezibafe.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/41206519913.pdfIn PDF document text
    • https://songhongresort.com/img/files/posofonisuganivipozowove.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/61415598077.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/puzoximanibivij.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/40311280344.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/pabuvolulabemo.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091312462880.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/30487151493.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/fuvamixelegavoj.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16130b07129dfb---92478990881.pdfIn PDF document text
    • http://forti.in/userfiles/file/34197956320.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_off0000e9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 17764 bytes
SHA-256: 25f3129b85a61404dc70823905504914c1285a77e7d00fc2e65514fc7113fd43
font_01_sfnt_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 10512 bytes
SHA-256: c3a3708f864ab0ceade0b71f72b9e4c00a85a1d4504e44993946990f4a38bb11
font_02_sfnt_off00012f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.