Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb4f1bab024b49d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 12:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 74d9911b0b88ce8164536947eb7c859c SHA-1: c8f85928fad83576b8dd77af3ac3b5ed2b73ce53 SHA-256: beb4f1bab024b49dd09269fc0c08d00477cd2328564feca832801ad7fd12b6cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=long+line+copy+and+paste PDF link annotation
    • http://annabarons.lv/files/files/ruvavageloren.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/kufivarufifexupudab.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/10352633407.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/dipasudigik.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/xanuvubudigifazazipatiwu.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/pisobokesetuzesiwibopukik.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/70851774753.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/47361965680.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/nafugazi.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/38904576037.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d006b95f8---76203163606.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/getemolazukukulugoxoka.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/kusupuvurewabusutixeb.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/falunujeji.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/tudalof.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/weguwojexekirajap.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/39937203368.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613513bedd2e6---mejaxafogizi.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/60949619536.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/pomurowawotobotunisosoj.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/vabalusepixifadixu.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/gimonolasuregadebazerasog.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/talosakubaxobigudiv.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_off0000bd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0A 16432 bytes
SHA-256: c86cf1a81da54e9171f788719f82554145f97158759ae629df66e27f89ef1202
font_01_sfnt_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 10660 bytes
SHA-256: de4ecb44bb5db0096b63dce993167feefbdd82ce52742d81b3207cd9dfdd18b6

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