Malicious PDF — malware analysis report

Static analysis result for SHA-256 899bea2e676d99b2…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 12:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8cebf19b8e07f21fc6821b4e71408314 SHA-1: 79116e3ddbd991cdb9af8917895212592d8c0b66 SHA-256: 899bea2e676d99b23acf0e028997304656cd68c2d736f377cad53c712ba49fff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm on disposable hosting. The embedded URLs point to various PDF files on unknown domains, suggesting a distribution or phishing campaign. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://visualmotion.nl/uploads/file/33219729830.pdf In PDF document text
    • https://gymlesgeants.com/upload/editor/file/penawilamisunojoz.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/laxuj.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f271c70709---21965036536.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/65246625601.pdfIn PDF document text
    • http://elitvorota.ru/f/file/xabaruwafifixun.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/xosunaxozalib.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/112150062985.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e5d0911ac---16159358059.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/kixafusebatilalofusuzi.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/xorugokopadun.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/25878254964.pdfIn PDF document text
    • https://nls.vn/upload/files/virivekiraxowufela.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/ninokefubij.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/53080707092.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/dijufamigetoridova.pdfIn PDF document text
    • http://cbstav.cz/file/lozedatudeto.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/29875617794.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/93204424200.pdfIn PDF document text
    • http://balone.net/_upload/file///16516742986.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/62128658226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mb+wala+appsPDF 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_off0000ca70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA70 9816 bytes
SHA-256: 2fdf5288406324890e3097055dc38c7b0f9ee53270414cc9fd768e5d10289048
font_01_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 17620 bytes
SHA-256: 80c36e193fe757c332ea122d5d5e1f92e759078b32f68de5ac0ff7feb57533cf
font_02_sfnt_off00010dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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