Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b501351f651a67…

MALICIOUS

PDF

76.0 KB Created: 2021-03-18 05:11:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cc524efdbd916782b9b4fb759574fec8 SHA-1: 98c628f60ae55fecd5723623b25441a2020b9155 SHA-256: 83b501351f651a67d2f2ea3ca50660ef5c6b7bed38201efa5d3dbe0fc59eca77
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to 'soxebez.ru', suggesting it functions as a link farm or phishing lure. The presence of numerous links, some on disposable hosting, further supports its role in potentially distributing malware or leading users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://soxebez.ru/award?keyword=9th+grade+math+final+exam+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/55439139-6633-4ad1-bbe5-8f1b98bc4a9f/vesumeni.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_75338b3218a2404cb1276f02783926ce.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_50b4f0a8464b4863a5d3529cb27f0b25.pdf?index=trueIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_3a4ae76372e347e2a015e38359fa6e29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce2ab00-3d5c-4743-955a-a80f63b1886d/mutaroxade.pdfIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_2bf12c9b935648aaad3b9386bc8d3379.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/analisis_literario_de_nada_carmen_laforet.pdfIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_25e173383cfb4112a5d74b07e895da20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6391ceb9-c4d1-4ddc-838b-5d8202154a5e/how_to_change_yunmai_scale_from_kg_to_lbs.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_cfdb4c68a8a7479f990b43b7bd807497.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73fa8cbc-8194-4834-a5eb-e8dd6779ecbc/tawekosumira.pdfIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_7d0a4fd24ac1448ab96518562f960fe9.pdf?index=trueIn PDF document text
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_1aa319c0e77c40c3ab0d9660f9b72d22.pdf?index=trueIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_9fe7c3bddc534b12befb7918ad53fd89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/uglies_by_scott_westerfeld_book.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_b77aa0d0d34f4e3e9d80e9efe7efaaa8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34882d82-01a0-4692-872a-cac126373a93/libro_historia_de_mxico_2_secundaria_sep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8aa7c9-5785-4365-b3f5-3b4d0c4cbcc8/38087867902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b71a66-2c2f-4ee4-932f-5ceade121113/jugof.pdfIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_b94a1c0af575439ea6ea336a00749261.pdf?index=trueIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_3b918b8cf2914b648b0d1e8edfbba8f7.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_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 5408 bytes
SHA-256: ed1271fb9be6843c47200832f68c13cb4b8008f5634ec3811a799f0cc1abb0a2
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 11492 bytes
SHA-256: a182e666e995c2686e7172c6ac1b88a4cff594d6b2dd24b674aedc315d0972d0

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