Malicious PDF — malware analysis report

Static analysis result for SHA-256 22dd12613621a72d…

MALICIOUS

PDF

84.4 KB Created: 2021-04-01 11:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ac1611377fc35ef64de95e2e0f6f7b53 SHA-1: 9107fd84eb53d77738006ce589ca2b57a7cd2ab5 SHA-256: 22dd12613621a72da9fad941c5e6c3a77e497aac6dc1d86fbdf65b4bb95f2ea7
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=best+ernest+hemingway+short+story+collection In PDF document text
    • http://remoliwagofaju.mywebcommunity.org/administracion_de_recursos_humanos_dessler_gary.pdfIn PDF document text
    • http://meetplafond.xyz/26666167453fl6r4.pdfIn PDF document text
    • http://igafnd.org/bdo_boss_knowledge_guidely81z.pdfIn PDF document text
    • http://alcexpress1.xyz/bradesco_seguro_auto_sinistro_terceirox7twc.pdfIn PDF document text
    • http://redtea.space/jifoxefzljq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/58930e99-1e47-4fa7-9f97-93d245170530/think_like_a_freak_audiobook.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_5f7a8cfb665746a080ad46dc91b12cfc.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_41fb7c7fdc504bf8ab8f4ec6c66d2ae8.pdf?index=trueIn PDF document text
    • http://dapizodipe.myartsonline.com/2009_victory_vision_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ee1640-33ef-42ea-939b-648038193bea/robaruzukawizivupepufop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d05a01d-d790-4e2c-86dd-d0e13de396a1/the_mortal_instruments_city_of_bones_2.pdfIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_65e714d202c04a5697e5aef135b1502e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c3b9881-054f-40c9-92d7-e283daf2a223/nespresso_vertuoline_troubleshooting_blinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b488691a-dea3-405a-90a9-40a6a1bac759/46488496795.pdfIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_e4c9bede2e36439197c8b6dc8cc6856e.pdf?index=trueIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_a3fa1e7f5dc94f028b20e8b7d76cf4c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa153e7-cf12-42a7-9390-d016a7eabafd/is_doordash_giving_free_delivery.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_59cbaba29c7c4515991953bda410ddbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/379610df-fcf8-413c-b79c-75b350c49b67/saledef.pdfIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_7a38b1dc804f4f6a8f30cb8d54e0a758.pdf?index=trueIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_7eef2aae6993460dabcdccc1b5ee9ed9.pdf?index=trueIn 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_off00010d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 5456 bytes
SHA-256: b017ea53fbe7d9791f80224cc44d4d43c4189e324b0202058c7d0f5e737012f4
font_01_sfnt_off00011f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 10704 bytes
SHA-256: b5f10597a89b610e8ad9a5635da1d095fdd4a4bf3194784034db11204fe18ae0