Malicious PDF — malware analysis report

Static analysis result for SHA-256 8213d3027017dbc0…

MALICIOUS

PDF

79.5 KB Created: 2021-04-06 23:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0ea9d3e4c1a42a98fbe2f3335188dd68 SHA-1: 97696b650d50d1602629304e61c6483b7ede80d7 SHA-256: 8213d3027017dbc0f42ea25f2c2ffe25e20bcf20aec82a4a7fe251ba060c9c3b
126 Risk Score

Malware Insights

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

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=the+umbrella+academy+1+comic PDF link annotation
    • http://vuwiwetidajin.mywebcommunity.org/61871599004.pdfIn PDF document text
    • http://loxotuxer.22web.org/67825203628.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/4251130562.pdfIn PDF document text
    • http://takimopunize.22web.org/calloc_malloc_full_form.pdfIn PDF document text
    • https://netavobedeve.weebly.com/uploads/1/3/0/7/130775758/e32f9.pdfIn PDF document text
    • https://wugoxuvalego.weebly.com/uploads/1/3/4/0/134017666/af0ba89be63d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/muvarelo/46428612763.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/excuse_letter_format_dlsl.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/assessment_procedures_for_counselors_and_helping_professionals_7th_edition.pdfIn PDF document text
    • http://tuxefunuzire.atwebpages.com/acta_de_constitucion_de_un_proyecto_ejemplo.pdfIn PDF document text
    • http://senakebuna.epizy.com/14535685930.pdfIn PDF document text
    • http://xifimerin.onlinewebshop.net/business_plan_template_canada.pdfIn PDF document text
    • http://jamivofobo.rf.gd/chikati_gadilo_chithakotudu_movie_video_songs.pdfIn PDF document text
    • http://radalimufan.rf.gd/star_wars_shakespeare_script.pdfIn PDF document text
    • http://dupizorof.rf.gd/d_d_character_sheet_randomizer.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/luvinaxekox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 4940 bytes
SHA-256: 4c64f23240ff05f172abc402071b910471077d76589d636a4f987ab1ce8e83f7
font_01_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 11496 bytes
SHA-256: 65eddee112f62228e58a138d6ea31706528f01dfbd4f8785892dc49f55187230
font_02_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378