Malicious PDF — malware analysis report

Static analysis result for SHA-256 607f882e65181199…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 09:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3076e208f96040c801776c985d17e26 SHA-1: 2f8b2b16330ea0e07be6684ff9b1051c5a1c0df0 SHA-256: 607f882e6518119917dc10bdd8ee9d7e736d94028e31dc8b350ca2c85cd70120
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and multiple external links, including one to an algorithmically generated URL, suggesting an attempt to redirect users to malicious content. The PDF also functions as a link farm on disposable hosting, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=game+badminton+android PDF link annotation
    • http://thongthien.vn/upload/files/webibelusozufeme.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b12a7299---jerodugeri.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/zumekotuxuxurebarezug.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/zudezumuzivabujaxug.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/56954990745.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/97887804112.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/ririgenuzedodajuvux.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/tadoxik.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/13374112190.pdfIn PDF document text
    • http://jaqalsports.com/files/file/22924600385.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/buxekoratamonifefadipofi.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/tewipugomovug.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/23978226799.pdfIn PDF document text
    • https://alpinashop.bg/files/rikatenufunoxufumivup.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/50201782427.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/fuvorafoniwoduseladiwux.pdfIn PDF document text
    • http://halanmilk.com/upload/files/zikarekotiritij.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/52456692247.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/ratezovukirolinalunix.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/55085109928.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5f97631f---21986931011.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mujefasuxide.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/bibujozalezedago.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/99671907084.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/ririt.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_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 18324 bytes
SHA-256: a04810aa9876414cd8fa91a338732603918827f37c3b872b055aedfb4f1c851e
font_02_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 10372 bytes
SHA-256: f2d6cbdbc707e441019fad4fac0ee7b69a9d01682cefebf8d69c70f14fd839d5