Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b63003ebb80c1b1…

MALICIOUS

PDF

91.8 KB Created: 2021-06-05 07:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fed4cb2a8da1ca1e9e3c6d514fd2b1a2 SHA-1: 719ace33e3d3eac6a895c895e3d504dbfc216f8a SHA-256: 7b63003ebb80c1b18f1739d62b7b571a680be0c65f5e629a1cf0e980b2b0b599
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 0.9997

Heuristics 5

  • 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 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://krisoc.ru/pbw?utm_term=disney+magic+kingdom+cheat+engine+pc PDF link annotation
    • https://rukewopesix.weebly.com/uploads/1/3/4/2/134266340/wexijazevazodabuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_60550c68f3aed.pdfIn PDF document text
    • https://lasunawinifomun.weebly.com/uploads/1/3/4/3/134385524/sukogotem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463287/normal_6007b18513913.pdfIn PDF document text
    • https://mexakogu.weebly.com/uploads/1/3/5/9/135981712/2270083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_603c21cac507c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_6052aff963dff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duziruromeja.pbworks.com/f/17006909858.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144648621/how_many_calories_in_a_shot_of_bacardi_limon.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/lego_titanic_guide.pdfIn PDF document text
    • http://ronuzexem.pbworks.com/f/who_is_the_ceo_of_allen_solly.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144466968/mcgraw_hill_ryerson_biology_12_answers.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/5226728136.pdfIn PDF document text
    • http://memofemovo.pbworks.com/f/87315077753.pdfIn PDF document text
    • http://vuxoris.pbworks.com/f/icloud_activation_lock_removal_free_ipad_mini.pdfIn PDF document text
    • http://jowenoxo.pbworks.com/w/file/fetch/144549429/project_topics_related_to_covid_19.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/w/file/fetch/144508827/bekodusivosalak.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144446886/netigurafu.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/91587205795.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11527 5524 bytes
SHA-256: 45c7195ca1f1b79571926219fe51a250f15d6baebb05652bed391ebe45b85be8
font_01_sfnt_off000127e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E7 10760 bytes
SHA-256: 9d4119ec4b909835af9009fa3112557b154060374d2989f7e495ce514d009583
font_02_sfnt_off00014ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA8 16076 bytes
SHA-256: 1882111c93182885355c326966aa8b929451d516289c4c69bffbc3e8f6f639a9

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