Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f20cfd95c511c2…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 19:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96be1b305e78d52174f82435f6a559d6 SHA-1: fd5a949d7665bcafee7a35a07025fc17e7f79b68 SHA-256: 74f20cfd95c511c26ace3cde952153f7b830339424f1dec0dcd0158791eb8966
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to potentially malicious PDF files hosted on various domains. The presence of embedded URLs suggests an attempt to redirect the user to these external resources.

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://atmaircenter.com/lb/userfiles/files/fabejoxug.pdf In PDF document text
    • http://gzbaosui.com/uploadfile/files/gawedebaduxe.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/35609467853.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130748ae1318---4065131322.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rigelepalamap.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/77960409900.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109060510115851.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/12743022567.pdfIn PDF document text
    • https://promise-land.com/upload/file/dozuziselaxifovivokurud.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/84408313890.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/dadabijenox.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/83867970055.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/91396038289.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/mesuguli.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/21611282092.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/dewuvomi.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/zapezezasun.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/46868485808.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/78892071387.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/todorakapexaluruse.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16136816ac012c---39713994059.pdfIn PDF document text
    • http://ahchala.com/img/file/85366583284.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/19340158818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=christmas+worksheets+for+middle+school+language+artsPDF 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_off0000d1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 11232 bytes
SHA-256: a7f896474555f846ecd2993d468b121d6b869479cc6bbdf3f131d329b8f4172d
font_01_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 17968 bytes
SHA-256: d991a324d37cf8aa6a04780cf48946f142945bdd266f87f33aaecab69a6d61a0

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