Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3e8e08efee44e0…

MALICIOUS

PDF

73.5 KB Created: 2021-03-09 07:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 26d27170e5ff438a72b77e74c5511bb6 SHA-1: d0e1b5ba8798226c94ac23cb9bb8029a24f647d6 SHA-256: 0f3e8e08efee44e0ff31876d6e077093821c551eee22a945efb710f5e714d92f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://jottigo.ru/123?utm_term=jazz+ukulele+tabs+pdf PDF link annotation
    • http://fanutoragozogow.sportsontheweb.net/stock_market_books_2020.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/os_melhores_cursos_de_ingles_online.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/lumisudowojisigavixaxafed.pdfIn PDF document text
    • http://verifybadgehelp.com/podegudogodokubemikv4so6.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/gods_and_myths_of_northern_europe.pdfIn PDF document text
    • http://cmb-accueil.com/cisco_e1200_firmware53dud.pdfIn PDF document text
    • http://bit7.top/bypass_frp_apk_6._07g6is.pdfIn PDF document text
    • http://julaximufe.66ghz.com/happy_birthday_card_template_online.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/wobipiwim.pdfIn PDF document text
    • http://baltika-trans.com/youjo_senki_movie_torrentr7u7w.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/fuselowiburi7l93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bikemeno.rf.gd/3572571098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c1667e-5f3c-4f6a-8a87-f0781e3530d2/masijizawezis.pdfIn PDF document text
    • http://wafubarig.epizy.com/kotor_guide_manaan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d6fe10-2462-47bc-b307-9bbca85d1915/x7_vs_x5m.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a477143f-30c1-4f72-893b-891027c2fde0/linux_python_development_environment.pdfIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_3979b3e0fc5446368308f3009dfb1bed.pdf?index=trueIn PDF document text
    • https://d9c73feb-c945-4d97-9d44-ff62a4b57c47.filesusr.com/ugd/12056e_52682d4436914ec6853dd0de65170740.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_c79df819430e49d792a84831f8eae4b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be907ab-8fc2-44ec-94f9-c512f24436de/jiwebi.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_48d6b194d6d3455982dc5ad5539bf4ed.pdf?index=trueIn PDF document text
    • http://revuzulikasulo.epizy.com/bronze_sheet_metal_suppliers.pdfIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_acf23f23cafc483992698cfb0645b078.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
    • 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_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 5180 bytes
SHA-256: e7554f7869580efa68c5402f858d0c06e4733af94478a5cffad9b9daf6e17146
font_01_sfnt_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 10544 bytes
SHA-256: 80cd7094544ecee5d3e73958272908eb06c792faf92dbc017579ca944cd66e19
font_02_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd