Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4a65be3b89d8c6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 02:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d11ff7d736dcb1b8a4b8aefd81f36f75 SHA-1: a501a274c43d8b562a6b06e04a83ecf75cccb2e4 SHA-256: cb4a65be3b89d8c618894def7c4f7c02ded5340e7e6656ad93e8f6307cae33f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to external sites, suggesting it's part of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

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://huntic.ru/uplcv?utm_term=how+to+print+pdf+horizontally PDF link annotation
    • http://yepuco.com/uploads/files/jodejotigizuperijozo.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/79765007682.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/54797269771.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/424591102.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/sivijobavapo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161328d670a449---71894659943.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/xamijopasobuximemutafakop.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/82377995892.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/vegupexalosikaxomi.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/vomilifinugorajorazijoz.pdfIn PDF document text
    • http://esteel.my/userfiles/file/vamenumukubevavisopadabog.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/sifozinaxod.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210920_005948.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/99551740123.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/sizozewemujubozafinazaz.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/jidili.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/vazixudulexewakugaw.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/23530955546.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/fasuruba.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/tefufisazawej.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/82786914557.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_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 17440 bytes
SHA-256: 20620afe62e5bec7fd024ab5668ae1dd8ee4429fe0b5c525587dc7f8a4692efe
font_02_sfnt_off00011c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 10544 bytes
SHA-256: 28e9fb031c474ffc287ed0db96649aee01537da1fb2c4e31f204aec28f79135e

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