Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3a54b91c8083c2…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 05:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4d64def96c70cfea3a37bd7f247a490e SHA-1: 3eb7fecee100901a2191a623a35d423fb8dde45d SHA-256: 9b3a54b91c8083c2637f9445f86023193e3cf2743c893b98eb0b379665727cc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=venom+online+for+free PDF link annotation
    • http://bettynblue.com/upload/fck_img/20210917/file/43135750117.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210909_154618_183.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/liwuxumadazagexezenuz.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/11257641999.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/xuzam.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210914015047.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140da4ecb8ff---loxiduzu.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/81732081391.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/sagidexuj.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/71294536556.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6e2f91ac8a60adc701818651b13b3a64/19462643489.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/gebidini.pdfIn PDF document text
    • https://equimat-cheval.fr/file/foxigaxobuburizupatemu.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/jananixonuborifebowatig.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/mowakiloxoduxobodoxudovaw.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/zagewikebaxume.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109042053394861.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/46278829196.pdfIn PDF document text
    • http://tochuchoinghi.org/files/weteziwepexon.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/gejomedumotive.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/12164783010.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/lifoda.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/31197770360.pdfIn PDF document text
    • http://labsshop.com/d/files/bitugaza.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_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 17336 bytes
SHA-256: 4a84b53fd1ef9487a4428ed0116acadab9d77cd5713adea10e1929cf4b7c67d9
font_01_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 9916 bytes
SHA-256: 3c8281eb7684290c5cb7daf28171ca8a80399c3850334ff26246408f667de1cf
font_02_sfnt_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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