Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d0114414047093…

MALICIOUS

PDF

71.4 KB Created: 2021-10-05 21:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a4af50f67d74605762acfec5123623e3 SHA-1: 1b7cb8253004ab0115ae1d324d2c107c3bccecb9 SHA-256: 87d011441404709392431482eba93fe74a9c356f8e47c782d754ad047c0794f5
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs suggests the PDF is designed to exploit vulnerabilities or lure users into downloading further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct, low-reputation domains, often associated with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://ketchas.ru/uplcv?utm_term=types+of+clergy PDF link annotation
    • http://sk-massimo.com/js/upload/files/fuvebagojuworiniwipika.pdfIn PDF document text
    • http://creationart.hu/files/file/xokanejutigim.pdfIn PDF document text
    • http://fourfoods.com/images/files/vesidakotevugawosenomu.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/ximemilopalapaluxozaxumaf.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/webepirixaxu.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/dejaberadufune.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/45948084989.pdfIn PDF document text
    • http://darstin.com/userfiles/files/21836773898.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/wufatogimalemevuvixolodog.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/zuwebusofa.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/munegapow.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ce569bf1470efe3d10ed860fede8d9a6/vusapiwaxotonaviridomiku.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/06b9fdf2b9dcff7fc510acade86183a1/ladilisorazazegujine.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/belaxexenexusofulaju.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/funilatariburosuk.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/18841692772.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/xilabazet.pdfIn PDF document text
    • http://emeat.ru/var/files/tijapi.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/zukewaruvotisinamumoza.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/2804217183.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/tifubenuwefidogigomufafi.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/16634368573.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/sugerekuxakuv.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/dobenubulawojizizavux.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/vetevageverozexiwafowisep.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/67501683220.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_off0000b509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1B 17180 bytes
SHA-256: 758541466ac493496a79d37b39c7dd5660714f56ca3c395d88fea8d7c577579f
font_02_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 10276 bytes
SHA-256: d22ee64eb1491ce9ad10a53756e5cf229ba53d828983452aea12c487f775203e