Malicious PDF — malware analysis report

Static analysis result for SHA-256 099ef2f53b1f6be4…

MALICIOUS

PDF

68.2 KB Created: 2021-03-19 20:55:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0326b3e484f360915578ce1b773b4a27 SHA-1: ee6d21bbe4aad1069c9b33d385b142a2e952e8e1 SHA-256: 099ef2f53b1f6be4347e81f37e3b5010fcf74db03bdee0ce898e51f43206792c
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 0.9998

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://baarspo.ru/wix?keyword=discovering+geometry+an+investigative+approach+answers+chapter+2 PDF link annotation
    • http://hallop.xyz/28156837506vg9td.pdfIn PDF document text
    • http://hellesypakk.online/free_download_the_firm_album_mp3uddvv.pdfIn PDF document text
    • http://xalafunil.22web.org/cara_mendapatkan_vsco_fullpack_gratis_android_2018.pdfIn PDF document text
    • http://the-english-temple.com/44846357519h61cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483349/normal_6025935556b8e.pdfIn PDF document text
    • http://app-3null.com/arduino_programming_language_tutorialwcp9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_60239d8e09911.pdfIn PDF document text
    • http://begemot.space/19453599759gp6fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_d6968d6a04644466998675ead3fc3ff0.pdf?index=trueIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_e2420a9ab04441e1bccb35ac4775a103.pdf?index=trueIn PDF document text
    • http://vopimivukaf.epizy.com/futibatilusebabovexur.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_7bf729df73a24fb988e011ef4347d43e.pdf?index=trueIn PDF document text
    • https://a79c6309-487e-499f-a993-0ac454a400c8.filesusr.com/ugd/747acf_8e05c271fc7a42e498d6c8222f25d5b1.pdf?index=trueIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_ea6c668c0cea43d09a3c97696ffef997.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_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 5700 bytes
SHA-256: 5da84ca77eb1a23b7f5775ccda33575c61ed9c233b130770d86bddf87ba17e26
font_01_sfnt_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 10544 bytes
SHA-256: 699259367b216e5fc229de257d0a42130e2db2407fe86c81681acac68fc27a4c

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