Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cf02a05a16c972…

MALICIOUS

PDF

71.2 KB Created: 2021-09-30 12:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 40f907da244d917696962b5107ebc6e3 SHA-1: 4c5d2d22bce2b11711270b409d94026061815750 SHA-256: b5cf02a05a16c9723426ebf1cc4fd81cbdbc6b071a3767c33b368b97423e56c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many pointing to PDF files on disposable hosting, strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=lord+shiva+hd+wallpapers+for+android+mobile+free+download PDF link annotation
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/41853913432.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-1/20210901153155974086.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/kedubufibepozupapevesegit.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/lekiba.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/jawezir.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/kolifotoruloka.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/81124927877.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/15744674897.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/d13a9817dc2bf92ed23f4373f30b80b6/38753256313.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091263014_687816353.pdfIn PDF document text
    • http://unityproductions.com/upload/files/56064120907.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/fatonefufusekuwumakeku.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/jajoroxojeniserunaxodat.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/73066216172.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/77105007781.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/mozunedisor.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/352217512.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/judixed.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/murik.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/58171178574.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/linifataxas.pdfIn PDF document text
    • https://grup-rul.ro/printuri-fi/files/80854272932.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_off0000b153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB153 10912 bytes
SHA-256: 10b3b3f67acc8432f4d3ca64cf93f0c86649ac82b4fd9da30b842116828012c8
font_01_sfnt_off0000ca28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 16848 bytes
SHA-256: dcef13d4d8640c06ceaa654516103521dddd348fef51a5f3555592e642b46abb

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