Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71e500c35eaf17f…

MALICIOUS

PDF

92.5 KB Created: 2021-09-17 05:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e83e0902f115527970cf9e1b94a248f4 SHA-1: 1636dd512590f9ad34d9fff6f93f40b44c61a479 SHA-256: a71e500c35eaf17f57551423510e67d80cac7c128023e7a9e92641ccf64c44f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://arenabilardo.com/data/_files/digup.pdf In PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/bizemod.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/dofulunusakilijizaje.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/josaja.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/kovotur.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/49526944152.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/33007916692.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/bunufavowapunidow.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/vigeturekalapofo.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/wekisigojajimirexapuzuli.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/68d668cc2ccc3bb0d35678247b9be3d2/veranuwotisipogadajodoju.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/45759693199.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/vebeloxozasoforike.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/66994436906.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/leribulakifedumup.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141909187c3b---xopime.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/74432814975.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/9144180064.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/24892056842.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109031201261905.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/46975913873.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/gadubelilebuvuw.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/20172555184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+games+on+ppsspp+goldPDF 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_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 10620 bytes
SHA-256: 482dc86fbd733af0641edd3ed377e2c908a0e33f7f7c956db089af44fe52d2b8
font_01_sfnt_off00011ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA7 18836 bytes
SHA-256: f100e1beb496b443707bd9f033c3c0ea4a2e84f955b6bf2df2bf442b62ddb191
font_02_sfnt_off00014cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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