Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6584dcf0776b892…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 01:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3150a9bedf31eb52fe4aca7683ccab32 SHA-1: 6e94ca0b2011dcb2c55785679726bf80a6eeb6b6 SHA-256: d6584dcf0776b892042e42b4771d4cf301f5333bed42e61ad7c9f1383d96b63e
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. It contains numerous embedded URLs, many of which point to PDF files on various domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vuoncotichdep.com/upload/files/76942593890.pdf In PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/47194202636.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/56133662142.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/1451327831.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/rekiwutixeg.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/tadovibage.pdfIn PDF document text
    • http://guowangcable.com/d/files/gokipagumim.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/keridobel.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/vomebuwedura.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1632305091TCg5.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/jipepufujabapebogogizimok.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/sipivorasofa.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6d0dfc3d96b62bb49953504b666da6d2/sikefulakulikazov.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/67350162021.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/momusirusazabupev.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/50795021576.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/kedej.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/zodojusasimutil.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceffb73191---16037778548.pdfIn PDF document text
    • https://mu3yc792xh-rl1.com/contents/files/muwesapobemuw.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/vodizemexumaxasorigar.pdfIn PDF document text
    • https://maturana.cl/upload/file/faliwo.pdfIn PDF document text
    • http://skomi.ru/img/files/file/noxilites.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+odyssey+comic+book+pdfPDF 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_off0000ae29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE29 15508 bytes
SHA-256: bcc1a39c3f281e0d8df0ceaa90cb094d41732baa0d7d53ee7cfeea2d0860158a
font_01_sfnt_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 10684 bytes
SHA-256: 4b98a374eddaa236dc3f26a0d4c9c4f0abe4edf46ba459da3694dcfeb2f12baa

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