Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf90d41fd4aced35…

MALICIOUS

PDF

77.2 KB Created: 2021-04-15 06:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d35c2fbda8e0fb493343d1b555b52346 SHA-1: 2c9db22bebb59f7e59e1f1205e617d50f62614dc SHA-256: bf90d41fd4aced359165d2bc29e89471b98fe8e2368f4eacea8ab3fce0671015
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, including one pointing to 'lozipotod.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of external URIs and the overall detection profile suggest it's designed to redirect users 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
  • 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://lozipotod.ru/strik?utm_term=hp+officejet+4500+wireless+ink+cartridge+installation PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418747/normal_5ff1751cd31f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368492/normal_6009a491954e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_6035866323011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_60639f8ac5c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_606276267ce59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_60553a0acbead.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/lawixagigubojajabi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_fab8eb1d9a7b4d1595bd494c02a9d9f5.pdf?index=trueIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_eca1847ff3634b3b8c920c058efd217a.pdf?index=trueIn PDF document text
    • http://jujobope.atwebpages.com/briggs_and_stratton_5.5_hp_engine_parts_diagram.pdfIn PDF document text
    • http://wujagenak.atwebpages.com/importance_of_data_analysis_in_research.pdfIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_1a552bd99a0d4848ab1b7c9a2879fdf3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b13b0296-6077-4662-b37d-280305b40be7/presonus_central_station_used.pdfIn PDF document text
    • http://ritumogadoj.onlinewebshop.net/dipado.pdfIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_bef2e185f048494c993b3337ffe76804.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_837ea5de23e84ecab710a88b35e74529.pdf?index=trueIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_ae00878a12a9475bba56b8a9e5d57b41.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_e32569daccd84dabae80bbb9a360d9de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2961bc8e-3338-471e-b2c7-6e0cb90ce862/72364110865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e27b5aa-8742-4887-9d5f-16ae624e1fad/lojaxokaleresodujevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d00a5125-b576-4543-a015-4709bbf6ae6e/que_es_una_unidad_didctica_segn_autores.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_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 5868 bytes
SHA-256: 14ef2222bb56278092a1f1e56c2a8e29cc9e66ecf97b199970d5db5b1e522eb4
font_01_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 10864 bytes
SHA-256: ad6599cc44fce908778b78e199cc754d8a84fde6f48d339ece8eae279e821735