Malicious PDF — malware analysis report

Static analysis result for SHA-256 4368e1443b75f389…

MALICIOUS

PDF

105.9 KB Created: 2021-03-22 02:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f0a9fa1dfa4492c48d58a5bba5db4da2 SHA-1: de26e773f282ac0374586a5f41dc00dafba742a8 SHA-256: 4368e1443b75f3893d0336ed1883402932becb6c97eaaa56817cfa7bab471d3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL pointing to a suspicious domain ('midufefew.ru') that is likely used to distribute further malicious content or phishing pages. The PDF also functions as a link farm, hosting many links to other PDFs, some of which are on disposable hosting, indicating a potential attempt to obscure malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/wix?keyword=110cc+atv+manual PDF link annotation
    • https://cdn.sqhk.co/mujejadalale/YdXjgjZ/kebamawakodalapopijavo.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/zDBdhig/resident_evil_7_game_download_apkpure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fc8d71ada04c.pdfIn PDF document text
    • http://liwexun.mywebcommunity.org/analytic_geometry_6th_edition_douglas_riddle_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/7b4Djb5/applock_app_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368467/normal_5ff7caf929a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490265/normal_60145f4ca8204.pdfIn PDF document text
    • http://bumalutaf.iblogger.org/bookshop_automation_system.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379220/normal_5ff668f287ad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_6057ca3e94496.pdfIn PDF document text
    • https://cdn.sqhk.co/faxonudogot/HQLjhfc/pejalinalurigeli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bezegoluzose/consumer_reports_used_cars_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/gestational_hypertension_greentop_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26547b3-33af-4520-a027-bcdab2bae73f/roxoviwurile.pdfIn PDF document text
    • http://welidigukiru.epizy.com/misalikumirejun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b938bc85-5888-4018-ac94-b3260db7ae6e/what_is_the_plot_of_game_of_thrones.pdfIn PDF document text
    • http://mukajuzata.rf.gd/free_guided_mindfulness_meditation_scripts.pdfIn PDF document text
    • http://benamow.myartsonline.com/10050846656.pdfIn PDF document text
    • http://beliraguw.onlinewebshop.net/63419576796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae6fa3f-3059-41bc-960a-ced59289627b/common_french_phrases_about_life.pdfIn PDF document text
    • http://fukokikedusej.epizy.com/64088308314.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/15724012629.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/sejikitevunoweramuridut.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5C 4436 bytes
SHA-256: f7e55627e535e80b68a7286100d9d1a79eb7aa1b89512f92195056afefa2a63a
font_01_sfnt_off00015e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E50 14248 bytes
SHA-256: bf01d6194f3bb136034b84b2534921d8b51b4a61176849bb3792b5e8de1be5ad
font_02_sfnt_off00018c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C47 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333