Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c3b5dd690a494d…

MALICIOUS

PDF

78.5 KB Created: 2021-05-13 03:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1e35a9d0d2fbff8752d7e6e0bea1b4ce SHA-1: b97c8472f2cceab97f8b01e76b0b4f94bf6b4046 SHA-256: 24c3b5dd690a494da435224c8729986e15c616f1d462a705551010c8e73135fe
186 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to disguise malicious activity as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=lowest+price+weber+e-310 PDF link annotation
    • http://begdas.fun/15841954419mecq5.pdfIn PDF document text
    • http://redirunna.xyz/7th_commandment_worksheetbncj5.pdfIn PDF document text
    • http://ogranicbio.fun/kulevaei3yq.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/bless_the_lord_oh_my_soul_10_000_reasons_mp3_download.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/23f957d3-d870-4b08-b319-528a9f606371/jusabupiruzaviw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dab38ed-9490-432a-994c-81f0554447e1/82913923597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/851a5bc7-a81a-4117-a8bd-6366c44ed556/44246478712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7bd437f-3a95-4559-8e32-ede79ab97643/arris_dcx3510_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae207e9-1154-408e-a0da-3d672f39227b/3742235095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2caf9cd8-7d8e-4251-98e8-57cc867588d6/14252924277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22dc98b4-1941-4280-b537-4c8d2987ab96/el_libro_de_los_sueos_sigmund_freud.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_238518b24047483fb2d91e94e03987f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e905609-ab18-46a4-a81d-5a244f2020ed/62122437628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df45615e-300f-4805-8a73-408a25414371/phet_lab_states_of_matter_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc74431-84ac-4646-a681-10cec2448ef4/roliwolapu.pdfIn PDF document text
    • http://dopovis.myartsonline.com/what_is_mercedes_service_b5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3227dfc-34fe-4b8f-af5b-57aae9cb2247/ronizuropukot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/887d35ca-e9d3-4771-aa9c-2c556475d81f/ley_general_de_titulos_y_operaciones_de_credito_tipos_de_cheques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5543c71d-907e-455b-b2db-3dfd3c664c1e/tutorialspoint_hibernate_example.pdfIn PDF document text
    • https://712e085e-8422-4094-ae2e-709d430f1fc9.filesusr.com/ugd/bf8edb_dbf2d2d2d7d5410cb98a1f43e1fe6080.pdf?index=trueIn 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_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 5248 bytes
SHA-256: 0a1d661fe96be2693301a021d310b4e0f27442e7e002d4a2ccd343199d7ddbf4
font_01_sfnt_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 11176 bytes
SHA-256: 7d0bce13ae4c1cfc260f073c064cd687a0b36ccad82d50b10948247537a315f9