Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7a2bdb60d9a258…

MALICIOUS

PDF

83.0 KB Created: 2021-03-17 20:08:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4305fefa958b82e8230eb46eaa734723 SHA-1: 963e7f6047d726fc8bbfc180e912850f31a5532c SHA-256: 3f7a2bdb60d9a25831e65e719325ffd8d44f40a302df502b17c2dd3e5859b1c9
186 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to attract search engine traffic. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of outbound links, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/award?keyword=catholic+high+school+entrance+exam+practice+test+pdf PDF link annotation
    • http://uspehdnyaaxyz.xyz/pokemon_go_battle_chartxhg0u.pdfIn PDF document text
    • http://biggymstoe.com/ice_machine_for_knee_replacementxku8c.pdfIn PDF document text
    • http://genusttwsr.fun/12991812649ktits.pdfIn PDF document text
    • http://bufo.online/4722203953629p8x.pdfIn PDF document text
    • http://lumogodasekepi.mypressonline.com/49899333374.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/30760818325.pdfIn PDF document text
    • http://thedefenseforge.com/how_to_run_a_query_in_microsoft_access_2007yel1c.pdfIn PDF document text
    • http://saduzemed.mypressonline.com/ny_dmv_knowledge_test_class_d_answers.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/22920794430.pdfIn PDF document text
    • http://doluridibulif.iblogger.org/spider_man_ps4_free.pdfIn PDF document text
    • http://joxutikomujawi.iblogger.org/simple_weekly_budget_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumurulepowele.myartsonline.com/pepodetevubuliravaxor.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_07873eb3fa234be6abaac361992bcb37.pdf?index=trueIn PDF document text
    • http://zopoxasemegivo.epizy.com/human_digestive_system_short_answer.pdfIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_581862f1d1ef4b38b2b6cabf1ecaa1d3.pdf?index=trueIn PDF document text
    • https://965bd944-310b-4209-a71a-d16e45aaced4.filesusr.com/ugd/5f02e6_b0ca23727b5e4c7d9d71bac93c45c1f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/51030534634.pdfIn PDF document text
    • http://sudiwoke.epizy.com/dictionary_worksheets_3rd_grade.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_1777824134844bea9f36fcae88ee584a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/doxifuba/nifeduroxunejeser.pdfIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_a18a30ad53204b099a7a05321df40bbf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisiku/difference_between_android_mobile_and_smartphone.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_1731cd240e834423a8ce025d93990969.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_ac9824b010934cc29606c6f233d4b131.pdf?index=trueIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_67652ab98bb142d1a26272cf6ac7c02f.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_8ffd4556b64c4d15a9d317dcedb5f383.pdf?index=trueIn 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_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 5540 bytes
SHA-256: 0bf22503cb95b1634caf0c141bdb3e283710e1d18fe5393947731ed6a7e61349
font_01_sfnt_off000114df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 11520 bytes
SHA-256: 1a381fe83fb531ae10d3b44ee656763c16494a6fcabfc06324fa8eaac2905fb6

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