Malicious PDF — malware analysis report

Static analysis result for SHA-256 4797e72dda52bb66…

MALICIOUS

PDF

83.8 KB Created: 2021-06-01 02:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: eb696b23cb188391a222a092d41c2e83 SHA-1: 22714cc31657332f077f0a5d31720a93ca80b191 SHA-256: 4797e72dda52bb66c8ff49245a2850fc0f0ea62f381c8c9b0fd771b5f8a463ed
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 0.9992

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://resalured.ru/123?utm_term=nelson+math+grade+6+textbook+answers PDF link annotation
    • https://juzopuxenepin.weebly.com/uploads/1/3/5/3/135383483/gupegus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417216/normal_5fc9474643389.pdfIn PDF document text
    • https://nukawopuriw.weebly.com/uploads/1/3/4/3/134347541/1166257.pdfIn PDF document text
    • https://rigokapine.weebly.com/uploads/1/3/4/5/134593974/9a3b7bd1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504870/normal_6060fccda0281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_60637ecf630da.pdfIn PDF document text
    • https://kujakaxu.weebly.com/uploads/1/3/5/3/135347331/8749250.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/167932ba-c799-4975-9d91-8e0f6286fde0/social_network_screenplay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f722f198-1285-4780-a4b8-f6298b56c5ba/everyman_morality_play_full_text.pdfIn PDF document text
    • http://nefusim.pbworks.com/w/file/fetch/144434712/jomutavuvenarokul.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144432363/pa_schedule_c_instructions_2019.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144418011/wupamage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9a07de-462f-4407-b426-a1a139826739/34000778238.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144427560/nofazale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/102ddf54-3d58-48e6-9dff-095441a3ddc2/ludafejotowoji.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/como_pasar_de_escaneado_a_word_sin_programas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04fdf6ad-c86f-4015-abb9-c77a89592477/95052240336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe760b9-9884-4eb3-b6c5-541f25d2d6f3/forrester_cx_experience_index_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/328be597-83ed-47ae-b938-07330f42b8f3/how_do_quantum_physics_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481f8b8d-f15d-4a79-ac07-0792b277070c/lupulutavamolujibelubugiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56745911-7dd4-49ee-aba4-313efcc2b360/ziwexo.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/w/file/fetch/144424965/64331431509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f76da6-cbf9-44d4-a79c-3eec81402767/mamazewozepefesadodinowot.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 5724 bytes
SHA-256: 071543ca880350c7685685d0df449cbdd85471ba6d35870f86539db67ec9f020
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 11868 bytes
SHA-256: 4c167c28239d101bd6090f0858308148e79a920b1947d8a878c0ae2e93df58f2
font_02_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15