Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b99071f5dbf20c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 23:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f2eaaac9d8ddbb36dcd979914e5994b SHA-1: 502cc004eb4eb21562af802419845766f0c658ba SHA-256: b1b99071f5dbf20c65dbda999172cf74ae8a6dd2664b49c6a71a75bf48bb32e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the structure and URL distribution point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://daydreamspin.com/userfiles/file/bumudaxoparazilawepas.pdf In PDF document text
    • http://hcbarrett.com/user_area/file/23671553502.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/82275137026.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/osrkef12g0lklh79vdpbq1p0mr/nivujanaxaliniluzilejubaz.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/51120620098.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/30377087349.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/derexumibotoke.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/kusikobefor.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/68812790992.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/rimirowabifijewuju.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/31691120233.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/81099989099.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/85583034156.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/tikamosisezufuvupum.pdfIn PDF document text
    • http://chinalabware.ru/d/files/77145322038.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/50413460097.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/foderitaj.pdfIn PDF document text
    • http://sakem.org/userfiles/files/19058588405.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/jidaseluragasik.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1934133aa---guwamejitul.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/sawizep.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/gopetira.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/xuwubujaporoxisojuwal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+recover+deleted+photos+from+memory+card+of+mobile+phonePDF 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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 17664 bytes
SHA-256: 14bc5612b104ac9107f27512361098473d85a1d01336fd7358250b90389dd448
font_01_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 11284 bytes
SHA-256: af55bf140fadee0ba8f625220cffaa208ff31fc8d8a2684c1286f836664a2954

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