Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd54137942b41751…

MALICIOUS

PDF

87.3 KB Created: 2021-09-24 09:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1546d39c24ac79333a5e6dbc2b3b5fc SHA-1: ab417a3f19a668adf56ef1e4433fa58f4bdc1dea SHA-256: fd54137942b41751a126502e0563e84c354f85878939e3791e2c4fa8af6af573
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm using disposable hosting and UTM parameters, suggesting a phishing or malware distribution lure. No scripts were extracted, but the structure and heuristics point towards a malicious document designed to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://americasbestwingsbeltsville.com/uploads/files/75776445302.pdf In PDF document text
    • http://sinching.com/uploadpic/files/202109211048287516.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329b6a07063---58876261224.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/rawepagupage.pdfIn PDF document text
    • https://alariel.be/userfiles/file/232792927.pdfIn PDF document text
    • http://espwireless.net/uploads/file/rugaxikurekotaranex.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/31256459091.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/96973523583.pdfIn PDF document text
    • https://posh.hr/files/jexuxowoz.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/galediz.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/boparabakatadifaf.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/79070452609.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/48475097711.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/talevovozaxak.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/56438187551.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/kajezomemoxirup.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/067ec330bb70cc49b1c6a2a44180ffda/lisotimajafokazarijifag.pdfIn PDF document text
    • https://medpressa.ru/files/file/17182874964.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/48845258585.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/falapejujelijisemapinonu.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210904203256.pdfIn PDF document text
    • http://mopron.ru/upload/files/xefopamizunukabovozixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+eyes+the+horror+game+simulatorPDF 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_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 16952 bytes
SHA-256: ac66bc83995463b059c892c563fc006b91ec098887f8854e8f107d2e9164b1d5
font_01_sfnt_off0001217a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 10996 bytes
SHA-256: 5564c76b8123ba6eee3688b455e43ff35b4ab137a378d39047f1450477ac0c1a
font_02_sfnt_off00013ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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