Malicious PDF — malware analysis report

Static analysis result for SHA-256 05643dbc01746eaf…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 21:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b16a80e9580ceebd8705a4d02c1d814 SHA-1: 90b119fd8d46c63b734b0cb4a39c1efd75fd67f4 SHA-256: 05643dbc01746eaf3183411bd90dceb5caed385f52b7c08e8c7d7bf84698b7c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to storage issues on Android, likely a pretext for phishing or malware delivery. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://dkind.net/userData/board/file/zivefapevefop.pdf In PDF document text
    • https://weborder.cloud/userfiles/file///62480554429.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/55620130712.pdfIn PDF document text
    • https://camelcarpet.org/d/files/bonajorijinaporenufax.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/wopufogexegexifupizo.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34493016164.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/pevidapuxis.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///39856145004.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/64787647892.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/kelitunekekego.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/sidulibolevakoguda.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630742585.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/66142443768.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/53568246046.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/22847725200.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/23988856926.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141ff696f2f9---fesexonake.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161426950094dc---falejizozudowe.pdfIn PDF document text
    • http://contua.org/userfiles/file/zubotufetakibaperuvonirez.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/13106566185.pdfIn PDF document text
    • http://ergakiland.ru/files/files/feretoka.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/kowesopitoxovudoreru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=storage+low+on+androidPDF 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_off0000cb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB88 17844 bytes
SHA-256: ff6152964a461e5d468883066cc62cd81211ae266ead06cdd45f28a29abb4b2f
font_01_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 10416 bytes
SHA-256: ef8f1bde1372ad41b014fa153276c9df4d75b1f845b522553835c50e441f1896

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