Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6ca9c4ff7054dc…

MALICIOUS

PDF

78.7 KB Created: 2021-09-14 00:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4271f205dcd44ac7dabad5a037217ab5 SHA-1: 1dc846d70a258a4f671276e539ff973d11ce56b6 SHA-256: ca6ca9c4ff7054dce712abf71d1007aeb1bd9679a296a97c7ad19496fef1221e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=best+spreadsheet+app+for+android+tablet PDF link annotation
    • https://sua.vn/uploads/userfiles/file/dorusavurebike.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/16985064715.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/75313605984.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/59984737363.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/tesureguvarux.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/40537257197.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/puvazi.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/22279610357.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/xilopegumodem.pdfIn PDF document text
    • http://hejia-ele.net/upload/94337965938.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/97588422065.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/47000121572.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/90953566417.pdfIn PDF document text
    • https://tekartltd.com/upload/files/60445774828.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/91028570595.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b455b27d6dace578219bd4884b1c7cde/denojozu.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/67179480818.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613109411dc23---15186435699.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///rolosadatasog.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/38764352662.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/sijetit.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/goxafa.pdfIn PDF document text
    • http://generoussecurity.com/uploads/63547871598.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_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 16800 bytes
SHA-256: da634f312eeb69528663dc699ca26d0cabd024205c799f96fa8f737b4b0e4c9a
font_01_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 10788 bytes
SHA-256: 46ab60fdb414c43642971b3afb93c179ecc436b0c0979296b96d79ed334c5351
font_02_sfnt_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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