Malicious PDF — malware analysis report

Static analysis result for SHA-256 678494b0acab8154…

MALICIOUS

PDF

69.1 KB Created: 2021-03-24 05:18:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6aa7e1e93028aa20eecc23fe5220fa4d SHA-1: 9840b1ead225cb394bf7a1f7c63781817c0f1693 SHA-256: 678494b0acab815491c2e00f87f520604500ebfccd7057737f6f02cb76a1dd10
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 0.9996

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://dafemum.ru/123?utm_term=alanyaspor+formas%25C4%25B1+sat%25C4%25B1n+al PDF link annotation
    • http://front-glass.space/6151667713hnwcl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376354/normal_5ffde41d6aadb.pdfIn PDF document text
    • https://pinosapop.weebly.com/uploads/1/3/4/1/134131344/dudenizez_nepizan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486060/normal_6006f8a14a08a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_6037236fc0b63.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/rabatavowolufewunu.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/xuvag5aw5e.pdfIn PDF document text
    • http://tidedejix.iblogger.org/seven_wonders_of_the_world_file.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/mikesisesenub.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/rawonanamepef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_5fd1e4f865b75.pdfIn PDF document text
    • http://sajogol.iblogger.org/iso_9000_quality_management_system_ppt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofogijatoli.epizy.com/tubexuwisaxajeketixo.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_0bccc205944d49ec9c0fb7c959c6cb31.pdf?index=trueIn PDF document text
    • http://puxisozebipisal.rf.gd/uber_data_breach_case_study.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/pisedumolevete.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_478c24b326ce4d9bb1c9acebb8338738.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_306bcd8363cb45e0a1abf0f42c06d1ee.pdf?index=trueIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_58822a2fea044d53a7bfbde1e1463883.pdf?index=trueIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_860f8822972f47fda91b77e9f0655164.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/castaway_2_premium.pdfIn PDF document text
    • http://dukazel.rf.gd/99143374899.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_off0000cf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF28 5168 bytes
SHA-256: cc0a37a97df4bfbe75ba9463b3c0fff1c7b2598f6b5babe72317f06b404541ab
font_01_sfnt_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 11572 bytes
SHA-256: b2085177092a7f1b6bbabfa5d21f9da782750c7bc09a7a6c612f24827b0c9ba1

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