Malicious PDF — malware analysis report

Static analysis result for SHA-256 273cd6ddeade7707…

MALICIOUS

PDF

80.2 KB Created: 2021-04-08 10:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 84e6bcd591dc01faa959dea288c616a9 SHA-1: 28dd15239d157858b92ff859bf93496796dc4349 SHA-256: 273cd6ddeade77071c0e95a79df91c65609740645364e8d0a9123c7658cf3452
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to connecting a thermostat to Wi-Fi, which is likely a pretext to direct the user to malicious domains. The presence of numerous disposable hosting links further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=how+to+connect+venstar+thermostat+to+wifi PDF link annotation
    • https://cdn.sqhk.co/gubujurit/nhiulii/feed_the_monkey_counting_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xajegakagiz/xjgokge/xizokubemegomawepuku.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/hfgiMco/gizipikanufosekuni.pdfIn PDF document text
    • http://fafabil.getenjoyment.net/pisasoma.pdfIn PDF document text
    • http://rosolab.scienceontheweb.net/reribugubivifixivos.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/jfMif9d/ms_project_2013_free_download_32_bit.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/0d87b57e-67b9-4c2c-8662-3353dd1b8e49/what_does_the_term_curriculum_compacting_represent.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_8120540aa3364837ad59456ae254a20b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c79b2d-4401-459e-bdb4-b4eb4b289f88/mokog.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/resume_letter_file.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/machine_learning_algorithms_for_beginners_examples.pdfIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_b8337f8026874ccdb4da53fc9d0c4270.pdf?index=trueIn PDF document text
    • https://67acb2b6-3e42-4063-a073-371cb527a15d.filesusr.com/ugd/a81d48_52a29026d3574fbe9d1fa5859085c2fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a09ad3e-1eb9-4be9-9fd3-a4ad2728537f/john_dewey_high_school_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b266c1-8712-425e-b08f-f32d129f4f06/outlander_books_amazon.ca.pdfIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/early_capitalism.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/singular_and_plural_possessive_nouns_worksheets_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d2d2816-22f1-4e8c-aa30-56518e7654b7/povakufakuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/the_man_in_the_high_castle_trailer_espaol_temporada_1.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/grohe_thermostaatkraan_ontkalken.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/47650793924.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_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 5200 bytes
SHA-256: 39e7c624fba336088eae08b06327220d958033d770cdcbb58f304d12fd60d101
font_01_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 10364 bytes
SHA-256: a6dd1425ba04a0ad23d32f1bc1643f0031a5ccac05257e3a8c8b2eb047bd9e88