Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be30255eb47d9c9…

MALICIOUS

PDF

79.0 KB Created: 2021-09-15 10:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 965b1f0689af4f37a3e82fc3c7075f50 SHA-1: f284aa4d844a5ea3f9dae986abd09000cb394e3f SHA-256: 5be30255eb47d9c94e8ef0b0b3d014dc9ebed198f70f5f76726b677cb33e1b93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on potentially disposable domains, suggests a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://elitaliaweb.it/upload/file/bisodedinigemupigobibikus.pdf In PDF document text
    • http://adance0112.com/upfile/editor/file/86705179424.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/dujezunuguzetog.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/55588503940.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/bimosudazogekixevulo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6241663d031a7643735072c2335edf4b/tikufakutevat.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/10838613159.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141622771371---84195386296.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210906_FA70742D322DC358.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/87074441400.pdfIn PDF document text
    • https://palet-school.com/files/files/jamiposajobobet.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/velefok.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/33962723266.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/fonirowomejarawovibizakur.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210911171006.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210909_000728.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/jofipeniwibimoxon.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/34331344192.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/57791901680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=alexa+app+download+for+windows+10PDF 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://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_off0000d4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 17436 bytes
SHA-256: ff882d28a3becc99c9a54f570f2cfe42206f2701c7de8ff916121965a4dcc45e
font_01_sfnt_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 10736 bytes
SHA-256: ebd5532eda15d138ede6b40ffedd9f5bf25f3601ed23ad05603e6b8a60c088ab
font_02_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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