Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e9bda3c3aea6b1…

MALICIOUS

PDF

73.1 KB Created: 2021-02-15 10:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4cffcc4e7b95c90b2ab9d584eb624c63 SHA-1: 2197f95ec5ab1aa6bb27953a6521db97016fd8e3 SHA-256: b0e9bda3c3aea6b16d583c35b50e7587262f58d95aaf08690dfc74c15b7d9e12
192 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'yafferge.ru'. Additional heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The presence of embedded URLs and the ML classifier output strongly suggest malicious intent, likely to phish credentials or distribute further malware. No scripts were extracted, but the document's structure and URL findings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=dan+russell+wrestler In PDF document text
    • http://leyloften.online/zupewumakamasemakanuverv96k5.pdfIn PDF document text
    • https://cdn.sqhk.co/godanalumado/Bihhcjf/avenger_xtc_hardtop.pdfIn PDF document text
    • https://rolurenogilu.weebly.com/uploads/1/3/4/0/134096536/bakojonev-bujimafeloba-revedukoge.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/niahheu/brhe_berry_photos.pdfIn PDF document text
    • https://cdn.sqhk.co/gatuwaven/7SgcjjF/webuwatidaxuganov.pdfIn PDF document text
    • http://strahauto.website/news_reporter_killed_ukjhjf8.pdfIn PDF document text
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/giperuvatoxof.pdfIn PDF document text
    • http://badgesverified.com/78930282632cg55r.pdfIn PDF document text
    • http://jegotaraxipux.iblogger.org/border_movie_song_likewap.pdfIn PDF document text
    • http://habercigo.com/creative_project_manager_salary_los_angelesbriux.pdfIn PDF document text
    • http://nevodoma.iblogger.org/cadbury_world_application_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/cima_management_case_study_model_answers.pdfIn PDF document text
    • http://fefomopopokelo.epizy.com/galajukazelogife.pdfIn PDF document text
    • http://lanosewidem.rf.gd/atf-_cleaner._exe_free.pdfIn PDF document text
    • http://foxoxamaxanibi.epizy.com/66678146697.pdfIn PDF document text
    • http://lidekajemunow.epizy.com/longman_dictionary_for_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/notepad_for_ubuntu_18._04.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/resignation_letter_template_australia_fair_work.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_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 4768 bytes
SHA-256: 00db09c6a4f4a93442662517add073c1c33f418a01655ea2dc3e0fd353484abb
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 10148 bytes
SHA-256: a6af48fe910019b6e174bc1ff98f9dfb9fd11c409d5e3b8694d7e08d319ae299

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