Malicious PDF — malware analysis report

Static analysis result for SHA-256 b015cdf5df13b9a1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 03:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0644bb12a222c34a30b64301213cc70b SHA-1: d2a04c2614b78858e3083598cb4705cf6aa51bd7 SHA-256: b015cdf5df13b9a188514a7881279aa1f876f1eb8db339504132494d58874c65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unique external URLs suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://norrlandet.se/userfiles/file/77730552063.pdf In PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/88107818888.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/39153028839.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/26504717091.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/sumunejas.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386373d01b8---wipapagiwivupawipi.pdfIn PDF document text
    • https://partnermind.cz/images/files/danejofuvilojugetiwani.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/kajorumefajatoku.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109190003592886.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/21863819202.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/vufopefevaf.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630809177963262803.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/51042848451.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/31280435483.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0829c996a7c9d61fe05c7e41718f1259/sakexu.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/lozonefitepuzinunidijat.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/rilagaburatelegolegak.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210916_56230D7F1A62441B.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109230007135163.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/52143711729.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/89693879540.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/kudesejomuxajav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=uninstaller+apk+proPDF link annotation
    • 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_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 18812 bytes
SHA-256: 0cf2de685a3ebc75b9c1e2f4f5f1ebf1624863350d68e3bd46aa0123fe34caa0
font_02_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 10344 bytes
SHA-256: 605c43bb0ebde406c16e2d7b73d466e5506346a93f5a235736840b74c0706efc

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