Malicious PDF — malware analysis report

Static analysis result for SHA-256 985999b283d838ea…

MALICIOUS

PDF

79.5 KB Created: 2021-04-22 14:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 82e56685361b8ea438392f3effb050c8 SHA-1: 239b72916ae61fdf238c639d7e82ef4adb52b22e SHA-256: 985999b283d838eac4c4e1409c781e8308d69f35e8f325ff1b29db528ebbcc57
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://druttle.ru/strik?utm_term=how+to+make+hard+boiled+eggs+in+a+pressure+cooker PDF link annotation
    • http://foxiduwanati.mygamesonline.org/computer_definition_computer_science.pdfIn PDF document text
    • http://buxeletifexid.medianewsonline.com/atmega328_arduino.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/angioedema_hereditario_y_adquirido.pdfIn PDF document text
    • http://ravasixojodari.mygamesonline.org/11231727796.pdfIn PDF document text
    • http://betixisu.22web.org/99555831520.pdfIn PDF document text
    • http://negifowutagur.mygamesonline.org/53499069942.pdfIn PDF document text
    • http://fetedeju.mygamesonline.org/pdf_to_audio_converter_free_download.pdfIn PDF document text
    • http://serawuv.mygamesonline.org/89166879895.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/96015701026.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/83182892740.pdfIn PDF document text
    • http://zitarekatinupas.sportsontheweb.net/39667083997.pdfIn PDF document text
    • http://bajesiradevo.getenjoyment.net/jesez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/lutabiwupulizakatiro.pdfIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_a4936368a35f4f53be4d3cbbda6f4f59.pdf?index=trueIn PDF document text
    • http://mazizinopuki.rf.gd/ronenofadavuritox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f832e9-a231-4102-8d87-e4450f99f8c9/lajetujobolilofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee32c85-764d-4c1b-9d88-892184dbda24/how_to_make_a_personal_reflection_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd3d7bc0-b7fc-415f-abbc-892200409e2e/dazufigaxumixazez.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_a44c0321e39b47d89819d7323216939f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0531a42f-adc3-4c88-9829-ccca665ce8cc/rheem_ac_troubleshooting_guide.pdfIn PDF document text
    • http://xixakoju.rf.gd/formation_agent_d_escale_aeroport_de_nice.pdfIn PDF document text
    • http://vufigenetusanu.epizy.com/guwamusafunimifirutak.pdfIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_3209b1642a2f4743b88204fc637c8646.pdf?index=trueIn PDF document text
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_1d022239de57449cbf2e6dc23f9e3c69.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_82fba1e6d30d4de2b8b655aae7cf11f0.pdf?index=trueIn PDF document text
    • http://ditufadupogeju.epizy.com/13258358038.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_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 5744 bytes
SHA-256: 066866cd45a58dcd187735eae4840808a7b23d0af33328c5626630c4af4a6718
font_01_sfnt_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 10952 bytes
SHA-256: bd0920677758a8ac4c9a5a5ab5c4295ea4317c3b24b95be748f40f9b65fe00b2