Malicious PDF — malware analysis report

Static analysis result for SHA-256 bece4191bbfdda3f…

MALICIOUS

PDF

73.2 KB Created: 2021-04-28 03:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: cba25a7fa380cd2de1357925f6d8ea5c SHA-1: e783a27052ecfe169baabf4abbd60446359ab0a9 SHA-256: bece4191bbfdda3fb44abbe2af3aa8ab68aef2098aedc8e5eea482da8d5e1258
184 Risk Score

Malware Insights

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

This PDF document contains embedded links that redirect to a known malicious domain, dafemum.ru. The document body, though heavily obfuscated, appears to be a lure related to a search query, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+does+lf+mean+on+a+maytag+bravos+xl+washing+machine In PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_604980397d44f.pdfIn PDF document text
    • http://galapaniwub.iblogger.org/dichiarazione_sostitutiva_atto_notorio_eredi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477376/normal_606c7ce215385.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17b3986-c148-47a1-b1a2-3954a335f9dc/livomukigefulumitukosat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32dfdb01-c05d-47d7-84fe-9be406650bff/bizejesavedulowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7db07b0-ca63-4a6d-bcae-8061eccb9297/vegetis.pdfIn PDF document text
    • http://bubezowi.epizy.com/the_little_oxford_dictionary_of_english_grammar.pdfIn PDF document text
    • http://bonizeza.epizy.com/java_interview_questions_for_experienced_professionals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe30967-409e-4187-825a-fe93b9d5e5f1/ingredients_in_dunkin_donuts_iced_matcha_latte.pdfIn PDF document text
    • http://sasumejexijow.rf.gd/halloween_word_search_hard.pdfIn PDF document text
    • http://rovunebezub.epizy.com/nuwixetumopori.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/fuleje.pdfIn PDF document text
    • http://ratotepuno.rf.gd/alien_vs_predator_mod_apk_revdl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad04fde9-617f-432e-bcfd-25e5adbc50eb/22715628534.pdfIn PDF document text
    • http://betoratawetaduk.rf.gd/makalah_asuhan_keperawatan_bblr.pdfIn PDF document text
    • http://bujavajivedejin.rf.gd/4826248035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8e5eac-d7d1-4897-862e-53548d7c5db0/23018343521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65807017-f578-46b7-bf0d-c8430afabd5e/pellon_808_vs_809.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/free_whatsapp_plus_abo_sadam.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_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 5908 bytes
SHA-256: 0c1d7550b5d81f3bbcbcaefee6ada49deb45046cfed446b9cfcb0e7044e385af
font_01_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 11188 bytes
SHA-256: b48c73985341ee0c42ce4ad1645fd8886688b47817c4990d43cd5cce3bc40d4f

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