Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb78e682d0a34d8d…

MALICIOUS

PDF

80.7 KB Created: 2021-05-08 22:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: be60ddeaf0e01fd3730f682fde7dbe84 SHA-1: dfda42861513839ebd09db351d7516c2e54c0c8a SHA-256: cb78e682d0a34d8d125d70d809b4535d2a5df154248e77e22e238f3298d83576
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one with UTM parameters suggesting tracking, points towards a phishing or malware distribution campaign. The PDF structure and embedded links are characteristic of a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=citizen+men%2527s+promaster+nighthawk+blue+angels+watch PDF link annotation
    • http://valuburikodajad.medianewsonline.com/55733619071.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/pdf_to_word_converter_free_download_full_version_for_android.pdfIn PDF document text
    • http://rosipale.scienceontheweb.net/gijub.pdfIn PDF document text
    • http://godezigupo.mywebcommunity.org/business_communication_process_and_product_mary_ellen_guffey.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/is_google_maps_or_apple_maps_better.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/esl_appearance_worksheet.pdfIn PDF document text
    • https://kofijowuz.weebly.com/uploads/1/3/4/4/134446653/wisenutudiwoxux.pdfIn PDF document text
    • http://ponemofetu.scienceontheweb.net/bonowavakojedozekag.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/acicw19/lord_master_brandy.pdfIn PDF document text
    • https://witetalujoloxof.weebly.com/uploads/1/3/0/7/130740434/bexadogosudenun.pdfIn PDF document text
    • https://cdn.sqhk.co/nizaveni/1hdiihg/the_ants_go_marching_to_war_original.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/cjbgfhV/songs_mashup_maker_app_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jakofawesavo/jajihic/34756887133.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/6jjhiig/winter_warmer_chicken_recipes.pdfIn PDF document text
    • http://patedeziw.mypressonline.com/fubusatadujesimese.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/0192fec3-00bd-4e46-92eb-448d59597ce0/el_arte_de_hacer_dinero_audiolibro_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4745f127-4168-4b57-8960-d381ae1c2f74/4610065996.pdfIn PDF document text
    • http://lowuguja.myartsonline.com/86822362541.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_off0000fc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 5632 bytes
SHA-256: a34fa3f02ef50fd65893c86185231a4f1ddf403b48493d933c0ed303e3bb0435
font_01_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 11292 bytes
SHA-256: 5e61e606e90391e7b6978e7c61aa982835fa60aad443a4d4f9bdb4bd43c986ea

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