Malicious PDF — malware analysis report

Static analysis result for SHA-256 9067a6bb9120531a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 18:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef75186f6ff48912bdfc85bca27b431f SHA-1: 861728797fe0fb90b096d8638c0e8e2a0910fde0 SHA-256: 9067a6bb9120531a782c2a3958e706baebb4e760ef2d800f70a599c85d2cd06f
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to domains that appear to host PDF files, suggesting a coordinated effort to distribute content or manipulate search engine results. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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 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 http://vervesimuhub.com/userfiles/file/kakotanofekoz.pdf In PDF document text
    • https://abofahed.com/userfiles/file/tevipubovubakawu.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/nuzazovepora.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/setisepobobilar.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/getateguwexota.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/judajudozezulurat.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142c96e4b8d7---88912161516.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/89778541706.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/47387773651.pdfIn PDF document text
    • http://dmkert.hu/files/file/pupazifelewelelix.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4a96dad7---39843126006.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/rovunexiwutu.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/jodigapabarefag.pdfIn PDF document text
    • http://web5gstore.com/Files/files/72409396445.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/duxoselobibasubipodijegub.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/58731388611.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/31800374341.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/35218034603.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/fefaxumivekapodi.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/zomojakenanugik.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/fosagupovilusujuguremolut.pdfIn PDF document text
    • http://altinay-law.com/images/file/wevozasekidu.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/rukalesejebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=xvideostudio+videoeditor+apk+2019+apk+download+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 11200 bytes
SHA-256: d7361b4e593454bbde363d7eb8263d283677dd4c348be360615eb1212417456e
font_02_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 17868 bytes
SHA-256: f55184494caa1502b68d5086c379ab4a62f4264742a791819bb7f71c1b2ddccc

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