Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae4869f130a60d4…

MALICIOUS

PDF

83.0 KB Created: 2021-02-24 13:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2e5d073af41913d41ecaf4645163753a SHA-1: b923d2d3e82ef9a4de76947f9a1073ae51556d9b SHA-256: 3ae4869f130a60d4340426ee6b0da9a6025b3e4c007a822ac145bdd63d2d0854
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 0.9998

Heuristics 6

  • 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 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://crophysi.ru/strik?utm_term=world+history+book+download+free+pdf+in+hindi PDF link annotation
    • https://cdn.sqhk.co/jaziwuke/hg7hgXV/64785192161.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484814/normal_60031c0308c75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fed4337d4eb0.pdfIn PDF document text
    • https://vepezoroz.weebly.com/uploads/1/3/4/6/134605761/3cec3da307.pdfIn PDF document text
    • https://cdn.sqhk.co/bidomutarili/eojb5EL/nudopex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5fda91b087077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_602998dc13b30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366055/normal_5fccffeb9a167.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483082/normal_5fe3f522331fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_6018e35cd6885.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500910/normal_5feba227e3f53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402297/normal_5fe4705d23262.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/kqjfijR/restaurants_near_me_island_park_idaho.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499341/normal_602b06cfef8d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410988/normal_602ce4f3b30fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_602f926157237.pdfIn PDF document text
    • https://cdn.sqhk.co/puwonereb/jgedmig/mijapenidoropadinulot.pdfIn PDF document text
    • https://vagobodowi.weebly.com/uploads/1/3/4/6/134600101/c12afbe9813123f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/kofabube/color_recognition_worksheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 5540 bytes
SHA-256: d5121ebc227639c2e5dcdc7f33a848b47af753ca3cd1c6818b3974477b209d7b
font_01_sfnt_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 11556 bytes
SHA-256: 495d95fc75a509b8a83f74f600f8303a9296342fced269c8c47d5b9f241fb82d
font_02_sfnt_off000120c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 8968 bytes
SHA-256: b56affb79068192b0debeac84f71041ef14db3af287880bb02db3a5f35f6556b

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