Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53d19cebf8c6702…

MALICIOUS

PDF

71.6 KB Created: 2021-09-23 05:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5182422e69a2b04392c33f2f9b852df9 SHA-1: 4537a5f15252a737b12ec271532f917455cbf241 SHA-256: a53d19cebf8c6702a3c61034631012470f0234c442ae1bac178f1e01cdcfa26e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs point to suspicious domains, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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=introduction+to+quantum+mechanics+griffiths+pdf+free PDF link annotation
    • http://taxplus.in/images/contentimages/files/fobirej.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/difevuditagazebi.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/98179084683.pdfIn PDF document text
    • http://chikatere.com/Upload/files/xemine.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/sonewide.pdfIn PDF document text
    • http://yjccnc.com/upload/files/vodapixapojuv.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/87419266320.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/72754265580.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/reperipikopokakuro.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/74147400124.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/jovilasupuruzidowo.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/doberuzuruzejisopi.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/38254160964.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/jaxivesikukatomogoxom.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1106630ce---ketuzusijeviw.pdfIn PDF document text
    • http://ombs.ru/uploads/files/51786602186.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/tufipopepavumuxoxigep.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4af61cc1f---17825956133.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/makukekumirux.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/51044182056.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/85047684940.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/12251905441.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/rasilunadip.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_off0000b717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2E 11220 bytes
SHA-256: b2d01af04e4d4d65409ac41f2e51d3d5de6ba4aee4f93f2c91506f3444fba84c
font_02_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 15716 bytes
SHA-256: ad6c2f14445921fa50034b0e565109ced4092a9781ed43e5d64213f6df97acbe

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