Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc57d18522deace6…

MALICIOUS

PDF

91.7 KB Created: 2021-09-20 19:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd5d8ad7b93a764a39330cbc897ad683 SHA-1: bbbdd5c3a270acfe41138704e7224a831ce4d5d2 SHA-256: dc57d18522deace6e110dd6644cb877bfc99e9b18cee63b8c38fa973d5d6754d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious actions within documents. The heuristic firings indicate external URI redirection and a high ML classifier score, strongly suggesting malicious intent. The numerous external URLs extracted, many hosted on disposable domains, point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=fast+9+full+movie+hd PDF link annotation
    • http://soles2walk.com/data/file/nadafi.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/napovaredudu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/cc7434bc93c6d587fdfa56cb7649ead8/60647363834.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/vawumexitofawir.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/94534639119.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/9672357479.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/63196127980.pdfIn PDF document text
    • https://matratva.in/userfiles/file/lufigezuwiruru.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/torugenivadirewazedub.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-7/20210907060104677753.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/90813929830.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/62675459840.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/29257542813.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/tadonufuvuzovavazumirokuj.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091107505435.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/47654070375.pdfIn PDF document text
    • http://origo.ws/userfiles/file/tapedalekagefixiniju.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/masinovawibud.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/gijopifiti.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/47241734104.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/97780076414.pdfIn PDF document text
    • http://lovesenergy.nl/file/wonerebavijedujukapuworov.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/43325643175.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_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 17228 bytes
SHA-256: 7cb43111d7179a54f7ec0ff57405d5e39890a77edeb7d1ea16925cad25e86cb6
font_01_sfnt_off00013070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14887 10724 bytes
SHA-256: c41f7084b1cc5292fd95a5ef7a97c04ba97fef24216c515a4cec2327e409c0f9

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