Malicious PDF — malware analysis report

Static analysis result for SHA-256 9000c319cf9138a9…

MALICIOUS

PDF

109.4 KB Created: 2021-09-12 17:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5fac464db0371916991864d7c1bcb25a SHA-1: fb722b856c3da9cb6e7518821416b57480974dc6 SHA-256: 9000c319cf9138a98a76b993c7e68322116fbaac858d96a0ee0e7309d113df3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests the document's primary purpose is to host numerous links, likely directing users to phishing sites or malware. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://seidels-mineralienwelt.de/images/uploaded/file/38388498013.pdf In PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/jevej.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/seruzalove.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/61320026845.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/kufizonepadagetemebi.pdfIn PDF document text
    • http://dakov.hu/_user/file/77247417428.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/75497156051.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/32114081299.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///8038386396.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613d74ce7f96b---vewuvavebe.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/96384749853.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/88548151652.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021922310153637.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/firipijivafaxuxavo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d26a3ba1ac---sededutirubawazonenebimad.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/92730708138.pdfIn PDF document text
    • https://yodobashi-church.com/41388596288.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631146116.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/37755583475.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/84643684766.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/rewexirosewadag.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/79430322667.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210909225350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=123movies+free+netPDF 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_off00013f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9D 21808 bytes
SHA-256: 75d1ececa107901b0d0a95e81488fe89780abf90ba967c18388bd6f0bc86ea42
font_01_sfnt_off000177ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19016 10480 bytes
SHA-256: ccfebb0cfafae13cb3e0f44299a584935760ec31fe380300cc9e95504612e0d3