Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddab08b8538384b…

MALICIOUS

PDF

74.5 KB Created: 2021-04-03 15:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6c3dad215123dde544b2a86140758af7 SHA-1: 5732f07d155cc5d8ff0df54d42ddb6f3ab380809 SHA-256: 3ddab08b8538384b922a2ab1bca2a7d64d70a6fae915bf52f68d0dab3311724f
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/award?keyword=biology+practical+book+class+11+pdf+state+board PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467300/normal_6056d011d60f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467038/normal_603589067340c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_601dca0346fc9.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/54670940616.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/ajbhdKK/best_music_player_for_android_2020_free.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/afmc_2020_question_paper.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/spring_framework_4.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/call_of_cthulhu_lovecraft.pdfIn PDF document text
    • http://wimebenese.getenjoyment.net/canada_map_blank.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvokitebixe/rahaPgc/table_tennis_3d_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/beogradski_sindikat_album.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_174fe25174a44cecbc6849602b763b7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/50264500874.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/how_to_program_honeywell_thermostat_th4110d1007.pdfIn PDF document text
    • https://45884d5c-3037-4093-99f9-9b9c28a1e9f0.filesusr.com/ugd/3721b1_9b87aa3b29f64e1382477e96ec25d44e.pdf?index=trueIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_305b77497b4e4e5190a07416a867de58.pdf?index=trueIn PDF document text
    • http://namepafubi.atwebpages.com/pajajifiwonilaropow.pdfIn PDF document text
    • http://vigexosav.myartsonline.com/jajujedusevilewos.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/99126630047.pdfIn PDF document text
    • https://2cc935b2-b854-4d3d-8499-e3bac5ec7384.filesusr.com/ugd/2e82fc_167c330dab564ffa980703fb0e0979df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/2624814722.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_eff56409c44648748b775a10350b95b4.pdf?index=trueIn 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_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 5728 bytes
SHA-256: 5881e26e5d29237e403153ea8665714fc63b292baaf6dc166ab615f56231f57f
font_01_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 10856 bytes
SHA-256: 874d191aecf2f81262f416d3b9c873375e778832ad1a67278a204ac945ac9f2c

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