Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0451b73e6246f91…

MALICIOUS

PDF

82.1 KB Created: 2021-03-13 19:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3d6a9e70fdfe16a3c8282c0516669fe1 SHA-1: 2e17458dc0642cb95958bc60878a3dde05a0a777 SHA-256: a0451b73e6246f91b18efd39f300cf13437f532c6cccd56f1bceda1a2a5e4c6b
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://bologen.ru/wix?keyword=isosceles+triangle+worksheet+doc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5fdb1aff1e937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407988/normal_6041ffe657a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452148/normal_603e90ccaa19f.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/gavobawum/background_video_for_wedding_invitation.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_a39de0a3f86b49d4a91f621fd24db0b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5857d3da-b3c7-41e6-bc12-99a50e8fc05d/mitrokhin_archive_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26eb21cb-351b-40ed-8898-edd16167240a/53277704080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b3fef12-3b4f-4567-bc77-9d975adeb817/hopper_3_connection_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/184276211.pdfIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_0edacad8aed04241979cea9226200814.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/58692966182.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/mathematics_olympiad_questions_for_class_4.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/how_much_power_can_a_stock_6.0_powerstroke_handle.pdfIn PDF document text
    • http://suboxasolu.rf.gd/pyriform_sinus_anatomy_radiology.pdfIn PDF document text
    • http://zaxalamel.rf.gd/happy_anniversary_name_cake.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/xuterisijonutet.pdfIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_81b37720d16649db8fdc53cb014f5c5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/filling_out_personal_allowances_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/smoke_png_video_free.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 5296 bytes
SHA-256: fada381cacf4ef830260623a93f6de431958b7628c63e753e5b2aa9f37be9ce7
font_01_sfnt_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 12796 bytes
SHA-256: 39aae3b02d19803d3593b107411f59755bae63a708219edb7b81a9a1239cde26
font_02_sfnt_off00011469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 16764 bytes
SHA-256: 3e28c5ced81d78ee741bff5627187d44fc9ef9ac8b651c2e181f2bacd6a19d6d
font_03_sfnt_off00012bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 6064 bytes
SHA-256: ceac4f053660788bd107b097968a5991d3ea1674894cf40e0a040ac0b72d8363

Open this report in the interactive analyzer, or submit your own file for analysis.