Malicious PDF — malware analysis report

Static analysis result for SHA-256 be27c54e8c9135bb…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 13:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fc1f6e848e5007d1ab008a043c29639 SHA-1: 65609233a3545e14174520032497a379d45c0873 SHA-256: be27c54e8c9135bb9011481d39416b3ec2eae19e16d9c3aa2b52cb8fba157cf4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, likely spearphishing.

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://medvor.ru/uplcv?utm_term=android+auto+no+root PDF link annotation
    • https://buddhaart.in/userfiles/file/74772534569.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/9427603111.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/sijume.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/sazeko.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/16476916502.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/47870604957.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/wesamobilanalet.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/xepemafusegazofiwomedu.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/26002342179.pdfIn PDF document text
    • http://sksound.com/userfiles/file/23216258506.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/muxamusumomozanit.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f3297eb76ab625fc6d729910090f8b68/borataba.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/punudamemuxukumoxibarep.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/dujotewatidowudurezaze.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/98065921973.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/41964081938.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/4908359395.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/10216502015.pdfIn PDF document text
    • https://insp.biz/img/file/nomigokab.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/43976010352.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/mapavotoxonubo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/d771226e7415ac7e0d2bee3df1790d09/nabudanezinupuno.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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 18240 bytes
SHA-256: 1ea166fba01dd06e40ecd480337320796ccfa1978898757822a6c7ac7cad5604
font_01_sfnt_off00011366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 9976 bytes
SHA-256: 86c359b36dffa72832963edf619d0ba7e24c9fc7fa5566ce32034d2da4342e55
font_02_sfnt_off00012996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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