Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdd336449cd1ad1…

MALICIOUS

PDF

78.6 KB Created: 2021-03-30 00:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e3aebec0c3d83574eba5725493f5b4ee SHA-1: fc7cae39db2c2849d0ad5d9855dab8bd190cd13a SHA-256: bcdd336449cd1ad18e1dab19103b397b17a4f2be77f269dacf706a6e1ba89c78
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several heuristics flagging them as malicious redirectors or part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to malicious URLs.

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://yafferge.ru/strik?utm_term=is+casio+tough+solar+good In PDF document text
    • http://rajajime.mypressonline.com/business_basics_international_edition_teacher_s_book.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/39f7a694cd76b.pdfIn PDF document text
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/rewufibelip.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/where_can_i_buy_replacement_stove_knobs.pdfIn PDF document text
    • https://cdn.sqhk.co/xugikokazo/apljgaO/western_wallpaper_hd_iphone_8.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/penoxozezugufovuga.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/QOhgp03/amazon_kindle_account_register.pdfIn PDF document text
    • http://rujurag.22web.org/9617127943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420743/normal_600331cc080d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452835/normal_604ee0461d2a0.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/igXhxjA/what_the_latest_fight_night_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/bULEVC6/dujivagikitarozupu.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/uhaPgjX/fire_alarm_testing_report_format.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dujisuga.epizy.com/josiloreketizudavu.pdfIn PDF document text
    • http://lipeporo.onlinewebshop.net/how_to_study_organic_chemistry_class_12.pdfIn PDF document text
    • http://pamilov.epizy.com/sokune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2ea0d3-b74a-4e70-b1a7-77918c9946d6/how_to_change_the_belt_on_a_shark_apex_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7650b29-b1cc-41a8-8374-d2f4f2dabce3/wow_maths_class_7_book_free_download.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_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 5140 bytes
SHA-256: fadfbbdfad02109e4a88fb0d5dc0074867a7d017675227674e0e98d0ba602efe
font_01_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 11276 bytes
SHA-256: 0dddd4813851ea3065c8fa06d8d9d61e232836357baea56f52a6fbf52a1fa050

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