Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8e43c44d105554…

MALICIOUS

PDF

76.3 KB Created: 2021-03-30 18:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c6327719ef9f2a7ce55fe912043cfb99 SHA-1: 4a1544b7959ad5585afd5737e842a495b776b1b6 SHA-256: ba8e43c44d1055549706aaab78c13be958bda42d1ecffc7f8dccefa5c7efa687
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=a+level+biology+book+answers PDF link annotation
    • https://jebezefekoju.weebly.com/uploads/1/3/4/7/134737834/3474395.pdfIn PDF document text
    • https://gaduforijap.weebly.com/uploads/1/3/1/3/131381464/bfe1b1.pdfIn PDF document text
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/37f03844d.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/tagobijisetowi.pdfIn PDF document text
    • https://puxedeva.weebly.com/uploads/1/3/4/7/134730870/1103150.pdfIn PDF document text
    • http://kevarusakoko.mypressonline.com/serviceability_and_durability_of_concrete_download.pdfIn PDF document text
    • https://fukopimuwevi.weebly.com/uploads/1/3/5/3/135351499/pajadepamelanur_kajiwixebug.pdfIn PDF document text
    • https://memarexegota.weebly.com/uploads/1/3/4/3/134366516/3038ac5c.pdfIn PDF document text
    • https://jupimoxojufe.weebly.com/uploads/1/3/4/8/134860775/5651146.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/what_size_file_for_455_rancher.pdfIn PDF document text
    • http://samokex.sportsontheweb.net/nupudevuxetowif.pdfIn PDF document text
    • https://zojipulororasa.weebly.com/uploads/1/3/6/0/136011419/jegipefisove.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_29508fee99e74ec7a3b287cf9fb78ba6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0507a739-d76f-453a-8670-dc4e047e7047/dapab.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/kingdom_man_tony_evans_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/belekefomadazolot.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_22968e2e32b84fb4bb6949dffc059ea8.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_6b33a96578d84a2b8ec79d9840d49fbd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/kazurenivip.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_ed1da9cdabd34336b0b1414ca3711320.pdf?index=trueIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_b649f2d02b504ca69659008785a00da1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de351dd5-fbf3-47ac-9e46-0a8faaf415f3/gikurarinujisiranaki.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_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 5300 bytes
SHA-256: c739a13513ef8dc556d70869a9de50e0dbc427b03b277602c943f672b544b0b5
font_01_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 10824 bytes
SHA-256: 57f7aa360f627301570cd450e718cfa1b4ae76f8a8d7991199cc5b5c69b0ff78