Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bffdf009e4d86c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-15 20:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2fbdfc0e7b9084d96e5572412e22045 SHA-1: 330e67e72a03650a9b9ec6b8f010184fd5aa8715 SHA-256: 20bffdf009e4d86cc2de5154773878bc97e2eec49a9fa1b5d56dd7fd0d0a795a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

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://pistant.ru/uplcv?utm_term=ap+us+history+notes+pdf PDF link annotation
    • http://margheritango.it/userfiles/file/wipipezosunilejeg.pdfIn PDF document text
    • http://taociren.com/upload/file/210910181457695376p02yv1d7i9rv.pdfIn PDF document text
    • http://dobre-akce.cz/media/files/file/xivotagulotigewib.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/wazinagobujiwajaze.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613f838714246---linofixa.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/kufedajikinedoselonojanug.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/64716168817.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/befoforaluf.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/70454257404.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210910110241.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/nuxaworemolibajabijejojar.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/57052255529.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/nemurixoxigi.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/jorenupadagagevex.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/zuruduwejuwixele.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/sotovan.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/49906017736.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/gewesoz.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/jikemo.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/99645324918.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161357b8803524---kobunada.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210909_016E224F881A21EC.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/gebozegomiviwurugokowa.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/66027168347.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/tiwimiremit.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_off0000c52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52F 10584 bytes
SHA-256: 7d20c5c4bc51f6db35c3642d453ad4d5075099605765e4f363760aa26ed69c4f
font_01_sfnt_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 17276 bytes
SHA-256: 0e064d10a819b7179fc031e629c4ef98aabf9d2c623d6ea98fb0fba1af2679bb
font_02_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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