Malicious PDF — malware analysis report

Static analysis result for SHA-256 8584cb0b16059293…

MALICIOUS

PDF

107.3 KB Created: 2021-03-20 01:12:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4399aec7fc78e62811bfc2d4bf0ae21f SHA-1: fb26a5a56531edb93f00df88c5567acb7011d003 SHA-256: 8584cb0b160592930840a6c79ca57fad612da5068f672b57f43aaa5bb3c29e1a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • 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://vilenefex.ru/123?utm_term=authorised+signatory+format PDF link annotation
    • http://saxefitipar.iblogger.org/honeywell_th6320r1004_installation_manual.pdfIn PDF document text
    • http://kowesawu.iblogger.org/bourse_d_tude_vaud.pdfIn PDF document text
    • http://lumurezekosarew.66ghz.com/jasper_report_export_excel_tutorial.pdfIn PDF document text
    • http://vugadabupujexax.22web.org/steps_to_personal_revival_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/vovuzize/wordscapes_answers_level_124_arch_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/785b0d5d-f283-4fd3-ad4e-362787b8520d/rutet.pdfIn PDF document text
    • http://kozafulide.rf.gd/case_study_questions_and_answers_for_interviews.pdfIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_831c2fbe2b214ca9b6c1da048137bee9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0839e9e4-8f08-4f1e-8abb-46678f4402de/where_im_from_poem_examples.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_59ccdc9cea204be9a8b53a29ab1f5280.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c593cec2-60de-4452-bd79-ff5c6f321c24/blue_jackets_tickets_family_pack.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_5429523a31824d5bb0e0f96807e8b9f2.pdf?index=trueIn PDF document text
    • http://vobumubuto.rf.gd/kudezezijodigor.pdfIn PDF document text
    • http://mopuxogimofuzu.rf.gd/nuzazim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece6ef53-4c8b-4381-ad6d-7ffcbc59066f/tetamolevogapuwavimorugub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232337b6-dbcc-49bf-a8dd-3828808e9a73/94084648551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1960b4-55de-4fd4-b4ef-f32e13cf0131/how_to_time_travel_back_in_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cfbb45e-5915-4f3b-b49f-edc1c6a09b1f/69344523259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3fe94c-76f6-4479-85e1-c45950b54485/kirby_vacuum_repair_mesa_az.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/13703658740.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/makuwuzubemizef.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C94 5264 bytes
SHA-256: 77ff33ba6edd6e6cea36103a7b7e0d88396f41e10b501c2e0d69b5c78a762962
font_01_sfnt_off00013e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E57 12308 bytes
SHA-256: f048ecb49b88d772a22ee0f54c8ebe9e3d790814aa31389736c51dd047c83edd
font_02_sfnt_off00016835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16835 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553
font_03_sfnt_off00017d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D33 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
font_04_sfnt_off00018b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B33 5404 bytes
SHA-256: 45381a3fc981150f8a8448e2cdb70dbb23d2de1179e0705278a30a59b938fd14

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