Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c991da123ca1a78…

MALICIOUS

PDF

76.0 KB Created: 2021-04-15 08:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9348293d2976a92b17a397ac5e97db72 SHA-1: e64b61504bfedb8bebf3fa79385b922ae6c69ed9 SHA-256: 8c991da123ca1a7813c4bbf7356301e2d6efab17c4fcbad6cdec8d146a035ed9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a maintenance manual, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=drz400sm+maintenance+manual PDF link annotation
    • http://christinaanddavid2019.com/minecraft_for_android_download_free61psl.pdfIn PDF document text
    • https://xafarigokexugu.weebly.com/uploads/1/3/6/0/136053206/wasujipur.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/e4f050df521e.pdfIn PDF document text
    • http://tokio-2020.fun/european_guidelines_dyslipidemia_2019qitcr.pdfIn PDF document text
    • http://winsl.space/did_humans_evolve_to_eat_grainsk1x81.pdfIn PDF document text
    • http://laulu-go.ru/zasotuq9kw1.pdfIn PDF document text
    • http://reactivaperu-2020.com/how_to_install_call_of_warhammer_mod_on_steamenr4x.pdfIn PDF document text
    • https://gonalibage.weebly.com/uploads/1/3/4/6/134652093/guvapuf_masazul.pdfIn PDF document text
    • https://kelaberukowil.weebly.com/uploads/1/3/3/9/133997250/1865754.pdfIn PDF document text
    • https://vodoxakitukep.weebly.com/uploads/1/3/4/3/134335140/rinitu_pijiwesum_pomenudemoti_wodopapovedamuv.pdfIn PDF document text
    • http://gagapazu.scienceontheweb.net/amoxicilina_clavulanato_bula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_7e404dc600914d42916ca080f591bd57.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_a07cf30f6df447f2bbda3c05fb3fc3e8.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_eb8af8bff39c4482b05209c82927e9cd.pdf?index=trueIn PDF document text
    • http://sutexuvidag.myartsonline.com/what_is_the_average_salary_for_a_marketing_executive.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/elementary_book.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_d34d2a09f5a14603923ee13c1c0ab347.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_78deae63411a49b8973aa24b6376f76c.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_050230fa293f4324827419a0cae868db.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_fdfa78c201ca489fbc31ea5163dc294b.pdf?index=trueIn PDF document text
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_2b58b932ab914be7a189bd50d5ec5603.pdf?index=trueIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_73e798b7db2b42039eaad9a2ba654696.pdf?index=trueIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_aba16bb1b6734be9942f73f990fd526b.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_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 5224 bytes
SHA-256: 5a8bae186f4583c4e3bba5a652668b700c9eae8df823d901dc9236790ba4a66e
font_01_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 10820 bytes
SHA-256: d706db000f7b2aa69bc331fad431b88eae801797c0f388a7d898809d999028dd

Open this report in the interactive analyzer, or submit your own file for analysis.