Malicious PDF — malware analysis report

Static analysis result for SHA-256 998d5a946d54c702…

MALICIOUS

PDF

85.6 KB Created: 2021-04-02 17:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6f255a54b608a5675674cf44f2b2e8a2 SHA-1: 561cefbf76a2372f9799294814c80f9f9823853f SHA-256: 998d5a946d54c7026384b399e45ea79bc1ec82ca86dbcd9079a3e1b5cc8f3d74
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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/wix?keyword=ap+statistics+chapter+7c+test+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444351/normal_605d05600748a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369162/normal_602fb6eea2d8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387814/normal_5fecc9400b2c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391317/normal_6029ffc1be43e.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/sgihidz/giraxadusadurimi.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoselubiki/gfVDjdy/12397384526.pdfIn PDF document text
    • http://tegor.xyz/south_carolina_drivers_license_requirementskqqqq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_6029494422af3.pdfIn PDF document text
    • http://securityverifiedservices.com/rixanufekakaf6u2ih.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491451/normal_5fca5e65d3dbf.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/iiJl8ig/32724819950.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402280/normal_5fc767357ec6f.pdfIn PDF document text
    • https://cdn.sqhk.co/mojesoje/hgjidgi/2302340663.pdfIn PDF document text
    • http://wedevaz.sportsontheweb.net/comunicao_assertiva_livro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_602b5c2463f43.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/HRSAmhf/pedorisezi.pdfIn PDF document text
    • http://vixemifojetinag.sportsontheweb.net/sofokalufubilosu.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/XtcggxC/prayer_to_call_guardian_angel.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
    • http://fuxunowelujuxa.atwebpages.com/kawosaduzavajeli.pdfIn PDF document text
    • http://torejejowomu.myartsonline.com/download_the_animator_s_survival_kit.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 4828 bytes
SHA-256: 9f214e4b2139a2c868e80d0ccbd0771d647a3cbc358f9a150613b68f155b51bd
font_01_sfnt_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 12156 bytes
SHA-256: 6eeb7680d5d39043fa0ffe02472a67e1481618d1deb727197c18569ababd4644
font_02_sfnt_off0001245a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245A 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f
font_03_sfnt_off000138c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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