Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0790a5fa1a3ab3f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 12:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d907ce44212832658e13de40351dc41 SHA-1: 6094e29ed58d25494d25ca58ae54c87112f4d749 SHA-256: a0790a5fa1a3ab3f91603cd3a76077e58f52494034a9ea31cc590dce05ea3a64
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on domains associated with file sharing or content management systems, suggesting a link farm designed to obscure the true download destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly indicate a malicious intent to trick users into downloading potentially harmful files. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://almuhja.net/ckfinder/userfiles/files/42777856780.pdf In PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/94196347445.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/rapoxolamog.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/66682549728.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/pilet.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/10340665977.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136cbcbcc961---33404639998.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210901205430.pdfIn PDF document text
    • http://specialcats.nl/media/files/bezuwebogoxuvo.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/2804551443.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/degabizewura.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/41562365859.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/35004368324.pdfIn PDF document text
    • https://telorgabus.com/contents/files/72010510814.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/7832538288.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/29951789148.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/38528770897.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/wewovegozilesuloki.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/fowukir.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/voxawejexunitirox.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/jamusuno.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccadd93c47---26800858573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=grays+anatomy+for+students+pdf+downloadPDF 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_off0000cc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC74 17944 bytes
SHA-256: 569da63075a97b0c405f69fb087f960c1dc599bbdba878bc7dc535e9ef45f386
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 10908 bytes
SHA-256: b1ba243d6ae9b9763ff5aa17bfa3fb034b5ca2df6942b42ef55402ae807a8082
font_02_sfnt_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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