Malicious PDF — malware analysis report

Static analysis result for SHA-256 2166d36513488b22…

MALICIOUS

PDF

68.7 KB Created: 2021-03-07 18:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 27b6ac0030630616dbdca59ec9e706d9 SHA-1: 6c6cadda2ac21e75ab57526d1f7c3033dcc01b17 SHA-256: 2166d36513488b226364ca0255194a634bd037367dba49aaeb9548968da5884a
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to external websites, with one URL specifically mimicking a search query for a cash register reset. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/wb?keyword=how%20to%20reset%20casio%20pcr-t2100%20cash%20register PDF link annotation
    • http://tunewejewuz.mypressonline.com/sexufos.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/photoshop_cc_2017_tutorials_free_download.pdfIn PDF document text
    • http://finoginujowiwi.mypressonline.com/how_to_read_your_birth_chart_wheel.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/67477660174.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/lagisifoxapanuwo.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/midudasogijeguboxafuzemap.pdfIn PDF document text
    • http://vavazexowupex.medianewsonline.com/what_is_the_legal_age_for_sexually_active_in_us.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_1e03ef935660401096d778dfe0be258f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e0d62e-eefb-4bc9-8b8c-a01bfd48d7b4/zepipujigob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0834fbcb-d5bb-4439-81bb-08c82e496a50/the_road_within_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/french_dictionary_audio_pronunciation_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/lasofimarunamuvo.pdfIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_a3924c7769fc4ce9be04c0ac4fb367ca.pdf?index=trueIn PDF document text
    • http://vejegaba.atwebpages.com/gurilel.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/xizikak.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_31baccb18031475db4acac586f4ff160.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f55ef22-98d1-474e-8df9-c9ead7ad094f/2005_honda_odyssey_catalytic_converter_heat_shield.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_e30aec7644ae4708a9d82568975fd944.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_7890086bc46745298b246d419a13f9cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/733becb3-ddfd-42de-8afd-fde7b912d1b4/ib_physics_ia_criteria.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/math_grade_5_worksheets.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_b09b702207564483b3a7c24904d1fa78.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_d6c64fa628144fcbab6dd7dffd9d9807.pdf?index=trueIn PDF document text
    • http://xutenujute.myartsonline.com/63959930537.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_off0000d11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11B 5576 bytes
SHA-256: 73e923787ea18b038e3211d3dcb4425a3cc8d9adb918b3b47df94d703654d66f
font_01_sfnt_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 9728 bytes
SHA-256: 6fb67152a66b0080701ef8e9478db86537a198836e5aef9d538ce275b86cc703