Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cbaebb0c74f498…

MALICIOUS

PDF

98.2 KB Created: 2021-03-10 21:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4aa5a114e9c25fd76250f1ee2a3744e1 SHA-1: 2b3bb36690dcf026984046aca13f6bcbd2c79f67 SHA-256: b1cbaebb0c74f4983e74c20607ad45ac6ebdefa52cd252607769554480a3e6d9
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 0.9988

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://golowaki.ru/wix?keyword=direct+inverse+joint+variation+worksheet PDF link annotation
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/ae22fb335889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495558/normal_60432f69aef92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450723/normal_600993a3b4f20.pdfIn PDF document text
    • https://rivixajonezil.weebly.com/uploads/1/3/1/4/131437445/vudugafifojuxubo.pdfIn PDF document text
    • http://kezekimoridim.22web.org/clat_question_paper_with_answers.pdfIn PDF document text
    • http://dagefose.22web.org/black_hat_hacker_mask.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470839/normal_601778fa3fb0e.pdfIn PDF document text
    • https://purelukanixavaj.weebly.com/uploads/1/3/1/4/131454065/furutiworule.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/4033386.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/givetobarok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367642/normal_6006abca465d6.pdfIn PDF document text
    • http://witaxiwudit.iblogger.org/gusumoxa.pdfIn PDF document text
    • https://sedemosifov.weebly.com/uploads/1/3/0/8/130874126/wepikelafizupajivalo.pdfIn PDF document text
    • http://tuboleso.22web.org/stock_market_open_on_labor_day.pdfIn PDF document text
    • https://tanavizone.weebly.com/uploads/1/3/4/7/134709943/kejexor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5fdc1956a06d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biwedudomobi.epizy.com/zilav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28471d04-4559-40f2-b7f1-4023308135c2/marley_and_me_2008_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03914482-9df1-4398-b0a3-f6c40f6bf5c9/count_dracula_book_summary.pdfIn PDF document text
    • http://wimarewixogax.epizy.com/aztec_calendar_stone_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b1116e-5c48-4391-9940-e0948ff354ae/89066748651.pdfIn PDF document text
    • http://vevuxuwomeb.epizy.com/bowl_games_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/696413df-e697-44e1-96ca-3289705c9c65/64229019389.pdfIn PDF document text
    • http://rizinesuri.epizy.com/guess_brand_logos_level_165.pdfIn PDF document text
    • http://zoxizagujaniru.epizy.com/settings_activity_android_app.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_off000131a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A1 5144 bytes
SHA-256: 3ea0e5d6f25eb1fd005b432925304985b068b49e97a5f846054b87e38498217d
font_01_sfnt_off00014334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14334 2052 bytes
SHA-256: f71a47484c95d7a8a65244bd51e38c405cd89f9b07b6a5ad15c9a573391ef875
font_02_sfnt_off00014bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEA 14768 bytes
SHA-256: 24d183443ca1d3224fb8531a9d9275360941e82aecda23d986086cbf0d85d961