Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0ee49236a1efb2…

MALICIOUS

PDF

83.7 KB Created: 2021-03-29 21:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5c2af5f1313b776cf43025a8f82e0295 SHA-1: 5f490762977ed7954333f023460171410e979feb SHA-256: da0ee49236a1efb2f4acb18a32cb37e55117a4da6d305bd5b803a4681ff53795
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=how+does+steam+work+on+lg+washer PDF link annotation
    • http://kikababono.mywebcommunity.org/digital_marketing_bsc_london.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/geDhawm/xononavevabalax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_60212964d720d.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/Ojghgf1/rikusafasafedimibeso.pdfIn PDF document text
    • https://cdn.sqhk.co/nimenodeloxa/haaChbg/50775310737.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/bTfzj8x/33207697977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407070/normal_5fc5bf87ca0be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402280/normal_5fc766af12b1a.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/c2iglhc/tupufonizepop.pdfIn PDF document text
    • http://kemikavar.mypressonline.com/vowilolukapegibizepu.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/c4gjusi/othello_school_district_jobs.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/latest_news_on_indo_china_border_dispute.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/njdjajj/dover_corp_annual_report_2017.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/how_much_water_should_i_drink_a_day_to_lose_weight_chart.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/038610a3-f13d-4864-95b0-a8964d64cfe7/a_streetcar_named_desire_play_by_tennessee_williams_summary.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/vopajikowe.pdfIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_830b99c1e17344778875c189f414f3f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/637d2447-70f5-4708-81f8-88aa2cf34d37/construction_project_management_best_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9511fd-f920-431a-8abc-4571d2a2e364/walabirepuvetorogeramutiz.pdfIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_f08eaeb7cdb24f758a6eb3ffbc5270f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31f37dc-45ae-4288-a1ca-f584c7e193ee/how_to_reset_a_samsung_vrt_washing_machine.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 5356 bytes
SHA-256: 33cef084250055fab45f814bc5773c0bb8fbfb78047c609f95ac4dc123624e7c
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 10808 bytes
SHA-256: 2447e584b393b598585c9ed83591a530a18f9a14bcb8d04174a789fdf7bca1cf
font_02_sfnt_off00012bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF9 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15