Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb905951e1205c4…

MALICIOUS

PDF

80.9 KB Created: 2021-04-01 03:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 951720858254a50d9d09994fa02e9c99 SHA-1: 988e3b13be69d352223c8ba965ebd8c91f7acea5 SHA-256: bdb905951e1205c4c24debd6d7940cb1d420ab2d74e8ed368445b1b3c7c4baa6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/award?keyword=albumin+test+pdf PDF link annotation
    • https://zopoxetofosifa.weebly.com/uploads/1/3/4/8/134863155/6549943.pdfIn PDF document text
    • https://furimulu.weebly.com/uploads/1/3/1/4/131411024/tezetezebaxukuxe.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/231011.pdfIn PDF document text
    • https://bemisawu.weebly.com/uploads/1/3/4/7/134716701/3216559.pdfIn PDF document text
    • https://pavovebowejimop.weebly.com/uploads/1/3/1/6/131607108/naropesaxuwunosa.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/f57f8b0666.pdfIn PDF document text
    • https://nodejobirutita.weebly.com/uploads/1/3/4/7/134748641/demaruxuwafa-wituxug-pevuduxorevodoj-burepa.pdfIn PDF document text
    • http://sivesesugipode.scienceontheweb.net/rewixutobobi.pdfIn PDF document text
    • http://demuxum.getenjoyment.net/bacteriophage_structure.pdfIn PDF document text
    • https://dimavuvinidet.weebly.com/uploads/1/3/1/3/131397938/dofipabam-sasumadok-beruzewutekare.pdfIn PDF document text
    • https://sererewaxux.weebly.com/uploads/1/3/4/9/134903335/patapiwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/80614ac7-25d6-4310-8f27-aa9d330dbb8f/online_quran_recitation_with_bangla_translation.pdfIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_bc31a39693694f4bb63e6c2c2de92a4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f434b177-ce81-47a4-b8a3-f20f64d63f36/lejexedaledugudufomefuvip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91237743-10cb-4445-adde-491a47fa5735/4811672251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35dc84ee-5737-4f65-902c-bab2e639a057/sewukipomojureti.pdfIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_9813bb777fb243b29104cddbece3a165.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38847a96-362c-47e9-adde-75ccb4358e55/gafozibasotup.pdfIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_90a5297dad94419c8b7553d53e9f8f74.pdf?index=trueIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_c7f99baf28324a908bf3bdc4264fe99c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/698627c8-054f-4d17-a8cf-5b8bcd909061/how_to_get_a_tight_knot_out_of_a_rope.pdfIn PDF document text
    • http://xazopufegi.onlinewebshop.net/convert_files_to_word_format_doc_docx_online.pdfIn PDF document text
    • https://medlineplus.gov/lab-tests/albumin-blood-test/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 4780 bytes
SHA-256: 98fbcb6947228f5cad0223e097435e8f2e2e70ff7e0ecc15a6f911b615529420
font_01_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 10464 bytes
SHA-256: 15d4a6989a2bed0e94909f034f912e74c4e292ba8390408017dfe36e6bae20ce
font_02_sfnt_off0001281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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