Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1c87373dddcf47…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 00:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0936642a3f41b8f85dbd229cdf4f4101 SHA-1: 2ab2831371008a2911256e740c3b57d394dec48b SHA-256: cd1c87373dddcf47dfaba101516612af9c751b213b6d2f209e43b789a54bcaae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are structured as download links with terms like 'download cs 1.6 apk'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or trojan delivery mechanism. The presence of multiple disposable domains and link farms suggests an effort to obscure the true malicious destination.

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 https://ketchas.ru/uplcv?utm_term=download+cs+1.6+apk PDF link annotation
    • http://terezszilvia.com/images/uploaded/file/57399276540.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/46361847981.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/31950502052.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/tijuwazagunubozujil.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/84010099733.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/getusafogal.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d8a8652e4cf833b6304be2b97c35abf7/20283886805.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0789ee1a29e113a0e3178b8b811f4b22/60746340199.pdfIn PDF document text
    • http://ccadl.com/files/20210911001155.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/55088837025.pdfIn PDF document text
    • http://www.andreapondika.cz/file/burikuruxedizi.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/xusizakabigilameze.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/tupidumowotesujasiw.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/28932054865.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/vevik.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/gewulaletaxopemubusir.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/pipomavive.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/59495054724.pdfIn PDF document text
    • http://asqcert.net/files/files/sorizepaf.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/gazaxalovatavinuril.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/sokuni.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/tusokosuzebugufele.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/47936315333.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://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_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 10552 bytes
SHA-256: da1709027be3c947d9b009c719ff9959aced76db54606114c1203fdcf8ae6934
font_01_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 18564 bytes
SHA-256: 371432023829d06c68e96665375c869ab305a02ce5cb1dc368b7cd9c7e441d86

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