Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17b7c93d1571309…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 18:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dd27fcda06af1997a12598f6472ab9ed SHA-1: 5eb3f0e90f747142deab3027dfc83a7a7179357e SHA-256: a17b7c93d1571309bbfaa6cbcfc90ed64852c3d8c5e853d32c2354df2c2dbe7d
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 0.9998

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 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://dugedepap.ru/wix?keyword=writing+piecewise+functions+worksheet+with+answers PDF link annotation
    • http://sopesukenapad.scienceontheweb.net/gudazeweximugogarobujenib.pdfIn PDF document text
    • http://gelokan.sportsontheweb.net/bonesaniwatewiwataxa.pdfIn PDF document text
    • http://leoidet.xyz/1st_grade_math_games_printablehhfax.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/jaOjage/1768965290.pdfIn PDF document text
    • https://cdn.sqhk.co/siduniberame/jeiejib/bihar_school_of_yoga_books_free.pdfIn PDF document text
    • http://study-english-05.site/91182933324sbjnt.pdfIn PDF document text
    • http://kivafijap.mywebcommunity.org/66366673700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454808/normal_5ff9a7552392d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_5fd99e0753a3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450438/normal_600283ca54293.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/6idKhfs/marvin_gaye_greatest_hits_vinyl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483072/normal_602b232330c63.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/jcjiicg/vomavarabev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kujidoxavok.rf.gd/26449311270.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_014843d630f842c9b8dcb191a43c262c.pdf?index=trueIn PDF document text
    • http://zuribetemeriguk.epizy.com/35535197668.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_40b69505882f4b50803d352c79465a72.pdf?index=trueIn PDF document text
    • http://xologikaju.atwebpages.com/knowledge_of_self_nation_of_islam.pdfIn PDF document text
    • http://moraruvotu.epizy.com/wenamujujedoleborifewafo.pdfIn PDF document text
    • http://belajuba.epizy.com/casio_g_shock_3230_manual.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_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 5416 bytes
SHA-256: 3e48793ef99f406e3c54ff67522ec4ae7e0caf5a884d37505c1117b7fd54582b
font_01_sfnt_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 10500 bytes
SHA-256: cf6fb4c45da7b077d1fab7d4aea3f7c8ffa99f628982d012d475c32aba89c4ba

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