Malicious PDF — malware analysis report

Static analysis result for SHA-256 baacc884140421a9…

MALICIOUS

PDF

74.1 KB Created: 2021-04-07 22:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 53a74e1c38a86f849cdaf0bcb6c78217 SHA-1: b3a017fc1738d7f7892fc8d997aaf6903c6db856 SHA-256: baacc884140421a948fc3ac0336884df90429bbfb5ee4153af3e0a19baddcd25
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 0.9956

Heuristics 6

  • 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 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://dugedepap.ru/wix?keyword=yookoso+continuing+with+contemporary+japanese+workbook+pdf PDF link annotation
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/3200374.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/47659248434.pdfIn PDF document text
    • http://nugowimabu.mywebcommunity.org/wuzojejuwivaminiv.pdfIn PDF document text
    • https://lakafoxure.weebly.com/uploads/1/3/4/2/134266374/musuwo.pdfIn PDF document text
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/rurewitozosub-vujopukanomi-kugususevasu-papikixufewoti.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/bifemafov.pdfIn PDF document text
    • http://totaxusozavu.sportsontheweb.net/tcs_email_writing_questions_and_answers.pdfIn PDF document text
    • http://miwewumexurigan.sportsontheweb.net/gorigifozewojoluvegage.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawerudarasikow.myartsonline.com/wosuzamif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7afdcc-48f4-4728-a9ee-39bde330df42/busuxinomodujon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62abaf6-58e5-4f65-9f44-3d9e86a9e15b/como_hacer_el_ayuno_de_daniel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48085c7c-d7ce-4791-8c74-452891e22663/how_to_play_dungeons_and_dragons_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/danny_boy_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01177116-e4e0-4ca2-955d-9e92dffaf886/91355476275.pdfIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/vefaju.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/samsung_xpress_c460fw_software.pdfIn PDF document text
    • http://fepusum.onlinewebshop.net/aerodynamics_for_engineering_students_by_houghton_and_carpenter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27026e51-4782-4ca4-8654-a08bfa69ca7f/how_to_find_discrete_probability_distribution_on_statcrunch.pdfIn PDF document text
    • http://zorikeroz.onlinewebshop.net/12899751843.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/adobe_photoshop_cs6_camera_raw_update.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/pediatric_dka_guidelines_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d111ce5-6e49-44aa-96fd-47476217ffea/smart_bracelet_your_health_steward_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ec2187-b260-4ca5-ad84-547b410c94e3/safety_razor_shaving_bikini_line.pdfIn PDF document text
    • http://totefopige.atwebpages.com/brewing_process_of_beer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daafe7a5-c2ff-4a3b-a3d3-749dc2f51b78/xopasibej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e850635a-7c2d-4a04-a22f-d6620ca07fd9/star_wars_the_last_jedi_book_reylo.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/jocelyn_flores_guitar_sheet_music.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_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 5972 bytes
SHA-256: 3494dcb64155fe67a1b792384de222bb75b3bb3ceb853d7f3cdd0f2bfd4f0308
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 10416 bytes
SHA-256: 9db8c3b3f8a49e981b105a514879add87bf2cb9fc3f5df6ee52bd39054c58176