Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7caf8e619cb9bf…

MALICIOUS

PDF

80.4 KB Created: 2021-04-06 01:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccc041219c5ab73fe07f578af56a340f SHA-1: d4ae6d4cff49f938b4c46080b2ab44fd3aba78bf SHA-256: be7caf8e619cb9bf9d272a91fbaf1451f8553eed8c4c18f049e32bc6e7361621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=essentials+of+public+speaking+6th+edition+pdf
    • https://static.s123-cdn-static.com/uploads/4458623/normal_5fee65bc2eb20.pdf
    • https://static.s123-cdn-static.com/uploads/4377115/normal_60086de2b8e1e.pdf
    • http://bamefidev.mygamesonline.org/what_is_the_septuagint_version_of_the_bible.pdf
    • https://static.s123-cdn-static.com/uploads/4415302/normal_5ff51b3d03d14.pdf
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5ff788ebc2b51.pdf
    • https://cdn-cms.f-static.net/uploads/4392666/normal_602f5d4a3c24b.pdf
    • http://jiteruruw.sportsontheweb.net/java_interview_questions_and_answers_for_project_manager.pdf
    • https://cdn-cms.f-static.net/uploads/4446270/normal_605c9a0e11dad.pdf
    • https://cdn-cms.f-static.net/uploads/4366382/normal_6041ae7952d16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_8156bbfbb39a4f2490ae7861dddc9fc5.pdf?index=true
    • http://donijexufenu.onlinewebshop.net/jowutazuvunobegitigusipos.pdf
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_b48e7d2848994d62be215c9234cd5581.pdf?index=true
    • http://wulibazosuxib.onlinewebshop.net/caillebotis_diamond.pdf
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_b9513c307c414074b301d03fc539bfcf.pdf?index=true
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_7e8285c03e99414aa5b01eef1c6479c1.pdf?index=true
    • http://noroved.myartsonline.com/zeludifoxuxo.pdf
    • https://d7301f0f-9730-4f6e-9d95-601e203cb770.filesusr.com/ugd/253413_ad45a4f8a7064e9ea2415fa127563b52.pdf?index=true
    • http://nakeviw.myartsonline.com/witebozino.pdf
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_e497ff58270a49e9812e1f29dd039fef.pdf?index=true
    • http://zorikeroz.onlinewebshop.net/85966310090.pdf
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_bdb27dcba8ac46ceb429e27c0cdfa1de.pdf?index=true
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_66914926b8b04dfd8b3a041bf393b53a.pdf?index=true
    • https://b9b086bb-db5c-4c47-b99c-4ca3d8c772c1.filesusr.com/ugd/c090b7_6a4fb913c2934f56aa9854812f6345bc.pdf?index=true
    • http://nufiwimuzobo.onlinewebshop.net/2020_and_2020_calendar_printable.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f8.bin
6aae4d9e0f04d7607f033fa7a752b34e98f96483498c4c321b9da3c9e87e83cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 5636 bytes
font_01_sfnt_off00010721.bin
c3dfaa36af5713c5345ca894ac52e029f98113d9716e72f42a59b27e119b8890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 13012 bytes

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