Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dba717c18da18a5…

MALICIOUS

PDF

72.9 KB Created: 2021-09-21 05:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3ea0ff36715dba282ec3b8d5d0e64c1 SHA-1: 98fc7dfe796abc5cd3a1f34b2f3938f34012ff23 SHA-256: 6dba717c18da18a5f92998e76849aedd05912b6ee595979e7b624af19bdbf870
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=tamil+live+tv+apk+for+android+tv PDF link annotation
    • http://upnbkk.com/file_media/file_image/file/vugepomapo.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/makivibodeki.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/sakofabave.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135d97d40725---damilevalebaxogixunimebap.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/37988961113.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/petakebuguduvemeworuxe.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/53685515282.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/31252143509.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/vumegatibipasubibukovud.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/65489907224.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/88822155939.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/63651064834.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210914_114617.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/wokagupogek.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/edcbd2df0deece271f8c7004f7a0d7ac/35067615761.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/rixinoritupugopilemubizi.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/96033016566.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/46020922931.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/soforulax.pdfIn PDF document text
    • http://nemochem.cn/upload/files/49288538461.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/wigulusowojelam.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/mevukexuvagujigajebafeda.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_off0000b89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89A 10612 bytes
SHA-256: 0600be8a8a3a116c0cfb94fde040439365f59786de54752f06c65024e3cef454
font_01_sfnt_off0000d0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 17436 bytes
SHA-256: ef9c069a538190d2edeef03565cce228abc3b6f0746ef15dc145d6c5c3cd6067
font_02_sfnt_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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