Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e439fe6f87e007c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 10:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 965b6a84e28fdda3cb72bf432581cff5 SHA-1: de7fb2f70c789064edfc28d71c08e79d614c6715 SHA-256: 3e439fe6f87e007c328aef8f7c4f20562d838e386555a7fb75becb3f0f9c4cd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, such as phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://infrive.ru/uplcv?utm_term=kotor+2+trainer PDF link annotation
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/61166748746.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/jumibapake.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/43536306405.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/69944199801.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/6978350976.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sawiliniwob.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/51328254937.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/79481851035.pdfIn PDF document text
    • http://abwva.com/uploads/files/wixufosovimazatifefuk.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/59623347207.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/94699254432.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/zutojemusitipimiwelawutis.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/25320322523.pdfIn PDF document text
    • http://skupka23.ru/upload/m/59365213926.pdfIn PDF document text
    • https://membermimpi.com/contents/files/rudomaruwabunar.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a4c6c108---65751962672.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/tukudelutawibozuvumo.pdfIn PDF document text
    • https://atlantidegattico.it/file/62340658881.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/lonibaxupiduwumak.pdfIn PDF document text
    • http://dytac.hk/userfiles/dakowizamusodosasibinalem.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/xurozenerosimasanu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e46ba8d086d619124f143567d515a80b/82653789353.pdfIn PDF document text
    • 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_off0000d7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 18808 bytes
SHA-256: a2254925597949355c5032734495b3ef72772a28bd4ae8dfa1fd71badc8c3a52
font_02_sfnt_off00012123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 9996 bytes
SHA-256: bfebe06508da0107ddcf15f40a190bf99f668218dc8bc0b449a67c3d7eeb9125

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