Malicious PDF — malware analysis report

Static analysis result for SHA-256 4def6fc474181686…

MALICIOUS

PDF

84.0 KB Created: 2021-03-24 22:07:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bdbbcea4ffb39fbfc8282a45dc93cb85 SHA-1: 7dc76de496953044fb745eea71bbdc644fdf3963 SHA-256: 4def6fc474181686e3147ca027b9898b66a276cb992bba3c8a09f26424f2abf3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/wix?keyword=celsius+fahrenheit+chart PDF link annotation
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/kutopajololi_xejorelun_kapiram_sonotaduduxudif.pdfIn PDF document text
    • https://texifuxifom.weebly.com/uploads/1/3/0/7/130776695/0ad264ed1a1be8.pdfIn PDF document text
    • https://burerekubexu.weebly.com/uploads/1/3/1/3/131381452/2af87a3c.pdfIn PDF document text
    • http://detonicro.website/49378753017cjout.pdfIn PDF document text
    • https://zumaraje.weebly.com/uploads/1/3/0/7/130776401/5381797.pdfIn PDF document text
    • http://lishop.site/84020588490f8d9w.pdfIn PDF document text
    • http://help-business-media.com/jirupanoj8oikx.pdfIn PDF document text
    • https://dodoluwateja.weebly.com/uploads/1/3/1/3/131381806/03bb62048f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_9a3f18c12cdd4ba585f66f92b26ea30a.pdf?index=trueIn PDF document text
    • http://tumofif.rf.gd/wifemox.pdfIn PDF document text
    • https://f48bd47a-883b-4fd5-b48c-91096c2de617.filesusr.com/ugd/455f95_b12f37a794bf471391321a9ccd63d2fe.pdf?index=trueIn PDF document text
    • http://poravilotizeve.epizy.com/11430195351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a508f530-e328-4773-94d6-01d15074a1c8/41317511633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f4a6604-b227-4ba3-a54c-36c09968d77e/tapuraja.pdfIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_8a21b334f6f640babc65b0adb3c8a3ce.pdf?index=trueIn PDF document text
    • http://jokizexolej.epizy.com/calendario_epidemiologico_2018_colombia.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_dc404b91f8c34a85bee94a40b66f02bf.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_ffdf311d187e464c828f3cac1425f6d1.pdf?index=trueIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_c67dcf0e91274391a71714e01e6609e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d00c81-96b6-4414-af19-8c13b5d1f22b/vishnu_sahasranamam_telugu_ms_subbulakshmi_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3afc6dad-4080-46dd-8b5e-ba43858be56e/73727406718.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_a2847ca443104c0e8caa60ddbce7abbe.pdf?index=trueIn PDF document text
    • http://nuvipapijulabu.epizy.com/73879353381.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 4876 bytes
SHA-256: ea793433f902af601b9a52b34c620e0a038c3f665066df4720cf3ab4898bfd17
font_01_sfnt_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 11020 bytes
SHA-256: 83da0bab8c8d09407ffa5b7c9282cd57ad8de0258a7e951b6eea81b1d937cc62
font_02_sfnt_off00012c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2

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