Malicious PDF — malware analysis report

Static analysis result for SHA-256 797dbdb576121145…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 03:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 737d90c5dd014cbfa077b4349899c707 SHA-1: 3ed0aea09d09d3fa5b425d928405b19da374ea81 SHA-256: 797dbdb5761211455d9bbed8370c7b1abd723ef6b5704106cf44129f86db2bd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=x+player+apk PDF link annotation
    • http://secureyun.cn/uploadfile/file///2021091021192553.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/55935005651.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/53802983472.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/89944783483.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/46749876777.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/16259553529.pdfIn PDF document text
    • https://nistd.in/userfiles/file/66435529829.pdfIn PDF document text
    • https://shunnasato.com/pumuxepaxokasewo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614f95fe2aecc---39075957901.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/7508084000.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/56796068379.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/58284132082.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/97712867673.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/tinamugeliri.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/34891563187.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/mejowisumeketol.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/14102887069.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/tadosojimijepamugis.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/jovuzuvesejofegegokopene.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/lireredifano.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/58573089225.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_off0000afea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEA 18096 bytes
SHA-256: 77e56ecef0c0928291b4cb8f49c844b843eb571884530fc92052cdb4c2a1e568
font_01_sfnt_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 9876 bytes
SHA-256: 9324f1493d1e11aed75bd96d1459989aac6c7e471a0fc00f37233909a6c50f93
font_02_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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