Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ad52cb20b61aa1…

MALICIOUS

PDF

82.0 KB Created: 2021-04-18 09:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d99151ca5d3df339aa5dac254b831891 SHA-1: 7d0dfe5795f8a2d38431861cb6bb8770bfa496d6 SHA-256: 87ad52cb20b61aa125799508ce2b9e3ee4daf629a8fc5a5e2414cb08c40bffda
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm designed to host phishing content or redirect to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=the+birds+and+the+bees+lyrics+breathe+carolina PDF link annotation
    • http://zudepogumo.medianewsonline.com/comment_fusionner_deux_documents_avec_foxit_reader.pdfIn PDF document text
    • http://tonukavugu.mygamesonline.org/advantages_of_internet_in_business.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5fdf9e5deb32e.pdfIn PDF document text
    • http://pifadopagel.scienceontheweb.net/atcc_animal_cell_culture_guide.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/bioinorganic_chemistry_notes_for_csir_net.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/john_stuart_mill_utilitarianism.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_6003a666b4ec3.pdfIn PDF document text
    • http://dokaxirugik.medianewsonline.com/lifafodelozilosifala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_b7e461031c2644edbe772e2e5500ce64.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_c653aaa467204318aba9b66092426fb0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f2f4c2-d647-4a93-ac3f-63eb8a438184/sazozimotegusovapot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0b68e1-0165-4c56-87ba-da64b772df0b/moloredapofe.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_f58cc83f7bf84355aa621199fbf9e198.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf63e93-5cda-44f6-93ad-7df9a8279715/lakukazudifusosur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46bd5ec2-c7e8-490e-8604-cb6d38ccde67/modern_architecture_since_1900_by_william_curtis_third_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b18dcc-a38d-417a-99c5-33b782267134/what_is_the_definition_reflective_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8b2c14-ca36-4329-800c-a548675dcc6a/how_to_transfer_videos_from_canon_camcorder_to_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f81734f-95cc-4f9e-961a-4dac04d9eda2/xetepufevunavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e678afe2-384a-42c9-88c0-69fa37503cc1/how_to_put_iphone_11_on_speakerphone.pdfIn PDF document text
    • http://gemawinikifiv.myartsonline.com/xirulalefakaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/055fd265-54f6-41c0-b105-d59e8275da7d/kebemewigujiruxedil.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_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 5216 bytes
SHA-256: 5accea59022175512e98d3e754ad333cf3a177c4177308b3c6a9d7f11f4b4591
font_01_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 10564 bytes
SHA-256: 92a3e4ac63aaf86ff8c2f4b4446f67990c08a6239e435ed180b944926c1661e3