Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c3382fc8c2aba2…

MALICIOUS

PDF

73.5 KB Created: 2021-03-23 22:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 41daa37cf20b9b2dc19bf42c94328582 SHA-1: 30dc7f618a558b7208c7900e4f9462a89bd35f3b SHA-256: 09c3382fc8c2aba2fcd6d58f4c832ebae812034a4bf7995c9141b9c826476d8c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://fokemale.ru/123?utm_term=u+satyanarayana+biochemistry+pdf+book PDF link annotation
    • http://bumasujofoj.getenjoyment.net/edexcel_a_level_chemistry_paper_2_2018_mark_scheme.pdfIn PDF document text
    • http://xufopizaxeto.medianewsonline.com/turipabokuz.pdfIn PDF document text
    • https://cdn.sqhk.co/pawosuku/gyicifV/lilugivegosaten.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/clasificacion_de_los_numeros_racionales_fraccionarios.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/ifidieI/majakod.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/duwirorugenakofe.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/jhcigih/smart_classes_in_high_school_for_nursing.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/21_day_bone_broth_diet.pdfIn PDF document text
    • http://kitixukizogutik.mygamesonline.org/convert_to_ms_word_doc_online.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/3375d5f4-d2b1-47dc-89ff-d841e0cee24b/shade_of_vampire_92.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92da7c40-23d1-42d2-a807-c6fdbe8335b6/wuporumukuvotom.pdfIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_ecd335123f934fdfb1230d4fc5fb2fce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79983e1d-92e5-42ac-8ad0-8925cbf58d20/kimulu.pdfIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_d258d5e6f6944475a14e60faf1521073.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_8ed240c9e0fa41a992dd4fae6f4639f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bdc9bfd-1fe2-45a5-973f-609c139270aa/53300931069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc03453-4b65-457d-bca4-b42ae23aad01/sin_noticias_de_gurb_libros_gratis.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/fijogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15619d8c-43f5-4f15-b6ac-3fe280347911/pigopepavipuvulu.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_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 5660 bytes
SHA-256: 03609f416aa528f7957b846da6b93bcf3f78a882d551a358098e7a4f8f75986a
font_01_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 10484 bytes
SHA-256: 25eddf939c3c798ca73fb04d0c454b6be16a4352d4ae1603905e37ae74715555

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