Malicious PDF — malware analysis report

Static analysis result for SHA-256 e526a6387c630b01…

MALICIOUS

PDF

75.0 KB Created: 2021-09-04 21:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0e9e982732d173ed56de1f81d7addaf SHA-1: bf8c0657dc353a64f632ff297a55608751582b01 SHA-256: e526a6387c630b01d6c607e03a828ab397128f8019f3836ddf6b0f82ccbe8ecd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure point towards a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://esterkins.de/ckfinder/userfiles/files/74787305147.pdf In PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/76714248112.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/zitevawaz.pdfIn PDF document text
    • https://stvorki.ru/files/file/20345435088.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/mimotidiliwitogonu.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/nexika.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/77533036331.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210716_54CD95FE49374168.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/jejezegenenolijop.pdfIn PDF document text
    • https://spacio.hk/attachment/file/57765085347.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/58020608336.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3671741222bbd64fd5f2e6570edf0cd4/bavukotodulupeje.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/domudalesozufina.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/zovajujanibegilubizoxi.pdfIn PDF document text
    • http://wych123.com/upload/files/murewofazufo.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/44175229587.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/40322437347.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/taxakopapezukorolov.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dffa96789d2---xelodesaxedi.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/lomojezum.pdfIn PDF document text
    • http://alkanboya.com/files/file///gekadaravot.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/fupepemazalonatowidora.pdfIn PDF document text
    • http://besteva.com/upload/files/zifanugupelulefokusibaman.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/memibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=house+buying+process+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_off0000c391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC391 16360 bytes
SHA-256: 0e6505e7fc211c9a9732fedeae1c9148934e5d74167be93baa5ea3105aa8cb9d
font_01_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 10832 bytes
SHA-256: c74954f1891244312a3660293fb5d80a568f6b0f20b5b1cfdb67e0924495f08c
font_02_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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