Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d0a3c804ca45dc…

MALICIOUS

PDF

95.0 KB Created: 2021-10-09 16:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2e51ac1b7327e7f2bd984eaaa1152f96 SHA-1: c446aa4e69a4a4f1fc8a3126b9d64323682e8bb2 SHA-256: 23d0a3c804ca45dc074586a0d49c89b4a28a872d1fc15313fe4fc3516403fb14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm configuration. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm behavior suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=ghost+fight+piano PDF link annotation
    • http://pokorny-podlahy.cz/UserFiles/File/24775206173.pdfIn PDF document text
    • https://balmbeach.hometeamcorp.com/images/usr/marim.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zatuleniserejedif.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20211003_030547.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/folakixosubovejisesalupi.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/sajagufefeneza.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/funerugiwedakoxu.pdfIn PDF document text
    • http://webantikvarium.eu/tmp/6301798120.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/jagilikax.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/87772325110.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/98278021901.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/kopatewaxiw.pdfIn PDF document text
    • http://soupworld.de/upload/file/77243530622.pdfIn PDF document text
    • http://skisun.it/userfiles/files/34914710927.pdfIn PDF document text
    • https://davaocarrental.com/images/file/31202693184.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c8fb36509---nerenujixukurob.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/pupojubigek.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/74377252670.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/b78cfqca8ojsoj3frrb9d8ukaf/lukafuwawuje.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/5896726970.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/fiwifaninigirojodikinimef.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/numomupibipelaj.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_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 19704 bytes
SHA-256: 966f0a087d82cd9fc3185ecdecc5ee90e7034dc27753ef2aa38b63a4a5891cfe
font_01_sfnt_off00013f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15744 10396 bytes
SHA-256: 297e3f47c4c0656dc7c1239f3c074b26075e6886675668aade3559761d977c0b

Open this report in the interactive analyzer, or submit your own file for analysis.