Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d234df6b75b1f89…

MALICIOUS

PDF

80.8 KB Created: 2021-05-07 08:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 95cfdbf72d786b93c411a59a4d8975a7 SHA-1: 980073641f90409ca3a98c6266be895053255d90 SHA-256: 2d234df6b75b1f89e0b96f11dfd275efb3986d480ff005b7f41f7b01c499e76e
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://midufefew.ru/strik?utm_term=nintendo+switch+new+mario+games+2021 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418984/normal_606d272c955fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422392/normal_5fc5a1b62c8f3.pdfIn PDF document text
    • http://kayikciakademi.com/sanigesimomcblx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_600ed66a42993.pdfIn PDF document text
    • http://zuwifipenabed.medianewsonline.com/capacitor_testing_with_multimeter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_6040f82340a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_606618793869d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402944/normal_5ffd518aeae9c.pdfIn PDF document text
    • http://edaruzal.xyz/48539556074im90f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_5fd74af4b3cc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501998/normal_5fe69e8ca9cb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503050/normal_5ff4c2cc3980d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5fe8aca1c20b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_42f60e1c0158465cace9b313991c58a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/406a0196-76aa-4688-9bf4-75c9148a2f1a/what_does_the_female_monster_represent_in_frankenstein.pdfIn PDF document text
    • http://zoligagomuwe.onlinewebshop.net/juzomomazifobasoruna.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_02f903af28464632a92173279dc875a8.pdf?index=trueIn PDF document text
    • http://wuwedilejom.myartsonline.com/personal_branding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333b0e27-1dd2-44a1-bac6-f934b1ab662a/82758609259.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_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 5708 bytes
SHA-256: 1f0194f1670243b5fc6ef5d2769938fd557d44dabc0692303390514faae38340
font_01_sfnt_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 9920 bytes
SHA-256: 6cb8f59003a60b22a3d539a1266d66f0ee4661953145e6bb1dacd7560def065a

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