Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e82711825eaf5cb…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 23:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9097aa42deb08bcc051a912ab54b053 SHA-1: 94958ce327000290ee79a0bf4a70738c42fdb0a3 SHA-256: 3e82711825eaf5cbae71763328827e20a28aad68dc0fd34219a2264b814651c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to external domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=squared+symbol+android PDF link annotation
    • http://inciboya.com/resimler/site/files/87774921096.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/9849707579.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/69690992403.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/sizulowepalegosuxasewaf.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1631011596/files/75581425994.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133967e06d6b---rajibadoxorimixoleb.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/19463041605.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/jefodagoki.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/10537774809.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210903222656_bjsb7b.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/sujelenorira.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/48720509212.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/xufunabejibakivesison.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/84557236356.pdfIn PDF document text
    • http://tencanpowder.com/d/files/59052758231.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ikdri31mprea6vfedk130dct6n/vidonufufezotip.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/3860091598.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/20990278428.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/lugelosipefolegujide.pdfIn PDF document text
    • http://renknh.com/ckupload/files/nupofugapapew.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/refegodukidowuxezolitap.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/1125915552.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/25297199295.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_off0000d5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C5 19504 bytes
SHA-256: cb28ae3f20c75fe374199eea0ecd76fa8673ed6cb74eebe89ff034eb7241c7cb
font_01_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001202c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 10884 bytes
SHA-256: 382b8f021121ca929ea3db7329766944216d2db47249020a934bbfc7ae2ced5e