Malicious PDF — malware analysis report

Static analysis result for SHA-256 f380b91bfa82fffc…

MALICIOUS

PDF

86.4 KB Created: 2021-09-08 14:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 910f4170931c0a1e3ed01b1e7b96dcbd SHA-1: acb415e9a6ace87dc786cc144aee0855ed07083b SHA-256: f380b91bfa82fffc3b3def60b9141b6d049746f585811528ff781491c557105b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including a link farm heuristic, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions.

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 http://pushgroup.lv/userfiles/files/32349450717.pdf In PDF document text
    • http://aexpress.lv/index/images/up/file/93461660283.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/zezixanigavuf.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/lubesiziravalikiluke.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/nimativi.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/37001531578.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131aefb48115---gukorolexoled.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/zuxewumuzimubanekuvu.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/gujegiki.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/vedodapimejefufuxotug.pdfIn PDF document text
    • http://timocomputer.cz/files/file/sebeman.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/xudesarukejadusibo.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/46840680207.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/35373994530.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/47466566996.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/lokiriv.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/kuzerezusubinonowolapefom.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/22467361583.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/466e7fb91d525ad81fa49bb1abdf58a6/lafadolajuzitolij.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/98454766840.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/manevetedabe.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/sunulejekatagesok.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210906143220.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/33624152083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=batman+damned+3+pdfPDF 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_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 18792 bytes
SHA-256: dba643e22f6582cc70c910fed7738b17f3cfd79a329fdb4808facca0601d7c59
font_01_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13496 10360 bytes
SHA-256: 54d53278596e0a66ab0d334c4fa33c05239bc793a920ffc36239c5f87e79b76e