Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b88094bebbf7afe…

MALICIOUS

PDF

75.4 KB Created: 2021-03-25 09:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4c342d1db4fd39d71a0ec55007826985 SHA-1: 1e8e3e44cfdab8bd5fa485510445781a0af83fb9 SHA-256: 7b88094bebbf7afed2629cc4bb300a2e3dd38f67a33e29df8daa46edea900201
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 0.9990

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://gimoguvi.ru/123?utm_term=c.+ronaldo+wallpaper PDF link annotation
    • https://cdn.sqhk.co/wazikunal/jDjhWhi/wunijap.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/pixefu.pdfIn PDF document text
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/3303ec991.pdfIn PDF document text
    • http://startbastar.online/campbell_biology_freeh9311.pdfIn PDF document text
    • https://levufaki.weebly.com/uploads/1/3/4/7/134743196/3325550.pdfIn PDF document text
    • https://cdn.sqhk.co/lidojuxuxiro/ichInii/new_york_company_near_me.pdfIn PDF document text
    • http://pop-marketplace.ru/43769315413jwcms.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/population_du_cameroun_2020.pdfIn PDF document text
    • http://winwites.space/ashtanga_yoga_books_amazonmknxj.pdfIn PDF document text
    • http://wagajij.22web.org/vefob.pdfIn PDF document text
    • https://banepopewux.weebly.com/uploads/1/3/4/2/134234854/2968036.pdfIn PDF document text
    • https://vofirojaj.weebly.com/uploads/1/3/1/6/131637635/f181c596fdb.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/how_to_add_coolant_to_a_2015_chevy_cruze.pdfIn PDF document text
    • https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/saxitizelitanetemamu.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/hiWwhih/xunogilununidofifufe.pdfIn PDF document text
    • http://dapurixid.sportsontheweb.net/arcgis_software_tutorial.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
    • http://pizenove.epizy.com/gegareboworikizoka.pdfIn PDF document text
    • http://nufufud.epizy.com/2018_movies_in_tamilrockers._net.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_7d9627a614c040d7893e11b52fa87386.pdf?index=trueIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_fff603173ff84fcf8570c760d0450942.pdf?index=trueIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_327e8bc28eec48ff97476da96d75002c.pdf?index=trueIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_72f5f701e60645298329ccfa4d3701e2.pdf?index=trueIn PDF document text
    • http://jabaxuzadowepep.rf.gd/checkbook_register_template_google_sheets.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_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 4580 bytes
SHA-256: 5f8a9d5ce64c88334772f05d9015b0c91d16a6e9c78e1cdb0c4b54a36fa1952e
font_01_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 11208 bytes
SHA-256: 313cf55eed3abf690ea5c1048c812dc88a522a4971dd0fd927dc73557932b2cb
font_02_sfnt_off00011200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361