Malicious PDF — malware analysis report

Static analysis result for SHA-256 853335d181acf7b0…

MALICIOUS

PDF

109.4 KB Created: 2021-02-22 07:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 20ad9368c7889d19c94ef87d552e5102 SHA-1: ad5417222297ff68ce071eda56a9bfc73af74f49 SHA-256: 853335d181acf7b0b1431ffca84421a8bda702f12d2f0cc6cf27ef59619e5320
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links designed to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=the+aeneid+summary PDF link annotation
    • http://lusoxokurutugap.22web.org/45260246447.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/g5qibyV/58931944426.pdfIn PDF document text
    • http://vabaxowerad.iblogger.org/storyboard_pro_5._5_free.pdfIn PDF document text
    • http://pububasolemi.22web.org/nowelupuzabodonupag.pdfIn PDF document text
    • http://zukilobuzoroko.66ghz.com/24733315285.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/jcMqCC6/witiduwibewefa.pdfIn PDF document text
    • https://cdn.sqhk.co/ramazunor/AOPjhji/download_game_stickman_warriors_fighter_street_mod_apk.pdfIn PDF document text
    • https://semizomemakov.weebly.com/uploads/1/3/0/7/130739936/8269958.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/Cgjijqz/smart_youtube_apk_android_tv.pdfIn PDF document text
    • https://guxovixig.weebly.com/uploads/1/3/5/3/135317997/vofujajosudizulage.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojasiw.rf.gd/format_of_article_class_11th_cbse.pdfIn PDF document text
    • http://navilifujux.rf.gd/saxapozenurewufagewate.pdfIn PDF document text
    • http://palipesokugukux.epizy.com/35868169726.pdfIn PDF document text
    • http://tisuvelepep.rf.gd/sudinir.pdfIn PDF document text
    • http://wanezezigemos.rf.gd/bernardo_stamateas_heridas_emocionales_gratis.pdfIn PDF document text
    • http://wuvesuwenelagaj.rf.gd/2019_calendar_word_template_canada.pdfIn PDF document text
    • http://novuzebires.rf.gd/modal_verbs_exercises_pre_intermediate.pdfIn PDF document text
    • http://dimesagir.epizy.com/beiimaan_love_full_movie_filmywap_hd.pdfIn PDF document text
    • http://zovebosovu.rf.gd/wikipedia_formosan_termites.pdfIn PDF document text
    • http://zujitix.epizy.com/rupekozazipinam.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001734f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1734F 5084 bytes
SHA-256: d91e04156a93578d73c907ca7d06a48c36ee57689937c69e773af54358de06a9
font_01_sfnt_off00018473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18473 10412 bytes
SHA-256: cee35da21c90b123c0190f5efd583619321c1052c09be098898902468d9f2153

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