Malicious PDF — malware analysis report

Static analysis result for SHA-256 2110a5208e5bda70…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 05:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2648e68a1632c4876708e88e497e655a SHA-1: d5c618b3abf91bedee6c34619afa42bde86f06ac SHA-256: 2110a5208e5bda700bbbd44fad1aaba5b99f6a62fe8aba751a7f16c419203f89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are linked to disposable hosting and redirectors, suggesting a link farm or phishing lure. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://wastran.ru/uplcv?utm_term=android+1+wrestling+revolution+3d PDF link annotation
    • http://primeasset.hu/fileok/file/77852769331.pdfIn PDF document text
    • http://agilesolutions.in/uploads/bigikexupuvubanaxenofe.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/nasiritoxazumiwake.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/puwutuwo.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/73646774294.pdfIn PDF document text
    • https://badoza.net/userfiles/file/pusakato.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210908191547.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210910091420.pdfIn PDF document text
    • https://buyafranchise.org/files/files/bejoj.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/62487169387.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219238996678.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/wezigadejaruxi.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/fujepanajatisixosi.pdfIn PDF document text
    • http://whatdwellswithin.com/file/rebugusinilaloku.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/kiribav.pdfIn PDF document text
    • https://businesslife.com/content/files/48915972014.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/36312784967.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/86351166187.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/76069589174.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/futewu.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/dodorovalopi.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/48097890910.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/48593992735.pdfIn PDF document text
    • http://iviltra.lt/images/files/77121340891.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a452849c---sipirikusedipoxomumivadez.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC946 17352 bytes
SHA-256: 807a016f3f7c4765a33868ba9d907a8457a422f1deb42a0a887f31b5b5ed5109
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 17244 bytes
SHA-256: 25dee67408a0be7b994ee43920fa8ca6454ef6e6043bf7f48ad3c47d7a5f48bc
font_02_sfnt_off0001102a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12841 10720 bytes
SHA-256: aacc726c82074171d659581555f5fac480cd8b0d83ae2bee23e0507080f8a1f8

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