Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d30d9ed24fc39a…

MALICIOUS

PDF

73.3 KB Created: 2021-09-09 10:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15469c0cc582a75c466b722d221313c5 SHA-1: dd7e9fe0348b04fa1fccd45721bb500520e22e26 SHA-256: 64d30d9ed24fc39a258a676e8164606437d53f86d0456b69b4fa52ec0b521c7d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded JavaScript stream and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=pvz+2+infinite+gems PDF link annotation
    • http://kommunikator.nu/demo/userfiles/file///6173281115.pdfIn PDF document text
    • http://eichler-kammerer.de/22152341899.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/kenotapokexuf.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/96962742849.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/nololigudini.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210903_F8ACF3FA33719EDA.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/76230314810.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/fojibebozamunotewe.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/pitig.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/79164678803.pdfIn PDF document text
    • http://poliinc.com/upload/files/rapetile.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/riwimuro.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/19646843781.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/90169292381.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21894418292.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/60472318837.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/fidunuj.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/6230751479.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/wolevit.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/18047386319.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/l08u7hth8uiqkb6rgnap43vi35/93586665292.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/95191626917.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/dujeresazapewu.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_off0000bdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB4 10376 bytes
SHA-256: 626a86bbba5ffbf78ac75325aacde82042db04a13797b1a2fdb633ca97a22749
font_01_sfnt_off0000d53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53F 16568 bytes
SHA-256: 1bbbf584d389d53cb0f8c4fd3b3ecbc15d8f4382694e362c0446d4fbda7706b0
font_02_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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