Malicious PDF — malware analysis report

Static analysis result for SHA-256 217e8ab04e8266d9…

MALICIOUS

PDF

80.8 KB Created: 2021-04-17 09:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4b55d1da964600ed1a1e22ad14b7b7fb SHA-1: b983903d320c30c27a66a75238832e84d65dcacb SHA-256: 217e8ab04e8266d964bf3b04cd4b4f0f531eb08730f46822dae19a11ce5058a4
156 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 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=best+picture+settings+for+samsung+q90t PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426696/normal_6056a3e9252a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458137/normal_5fe0ab396b675.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/free_bank_exam_books.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/roxawo/70114510608.pdfIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_6ac939fffa2c4fcc9f867be66f896a64.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_818a5e19ac8942e6b15c567b56663ec5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9febb2fa-6eb6-43b9-bc05-31ee11df8fb0/epson_v370_flatbed_scanner.pdfIn PDF document text
    • https://4694dce0-4d1e-4c77-b4da-d1f025f82355.filesusr.com/ugd/fb332b_944ae5e821d149f99de74a269fc66418.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_2fa283c4d07a4d27843821d520348a8c.pdf?index=trueIn PDF document text
    • http://fukuselumetu.myartsonline.com/94650344688.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_06acdb78951c4cc58c5c5ced20c04576.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/40518136917.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/28833010290.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_0afba5ce694b46348424a58d309af9ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af5c98e-3747-4466-98cb-4a2673ac9559/machine_learning_models_for_price_prediction.pdfIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_7aa1cf63bc6f455686637ef939dcfb9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96701e0e-5903-43cc-bfdb-a2dc0b8eacf9/nietzsche_will_to_power_sparknotes.pdfIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_a1cb95b8dd944ebd8f02dd63475cfbcd.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_277535cbd3fc4006b3e40a71a6271172.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/10436899704.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_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 5776 bytes
SHA-256: 9877943cde018aaf0d74c6e7ef481e83f63afd772b361053e8c0efa65e06b999
font_01_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 10680 bytes
SHA-256: 37d7daef1ff8d58c894deccad41917e192a868aa35456dceaa34cb3f75b0a334

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