Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37621e3603301dc…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 00:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0990147c21ae24413b2771e812ebb808 SHA-1: 7c791659b21ef84867c69c2b91704ea25a9c8acc SHA-256: b37621e3603301dcb576fc38e330b432306c5ed00efaf63dbe89e06aedf04e03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=watch+euphoria+online+free+123', are likely used to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=watch+euphoria+online+free+123 PDF link annotation
    • http://kp-technik.cz/ckfinder/userfiles/files/50479649979.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/wuguvinobowikoda.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/zumefota.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/mitivimidafole.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/59048417743.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/vurepokomoxez.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/tadex.pdfIn PDF document text
    • https://estoniapools.com/contents/files/fololaz.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/3306530384.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/8331924050.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9805bf5e309eb2937d14f660c77e6c0e/17509464977.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/vonixozeb.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/votufebezisimulule.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/84026776392.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210904202830.pdfIn PDF document text
    • http://hoogbegaafdennu.nl/userfiles/file/23474612731.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/roxodujagataduw.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0babc99e7---89947360861.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/xufote.pdfIn PDF document text
    • http://186086.com/upload/files/gukup.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/1285029693.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_off0000d480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 18408 bytes
SHA-256: 915509fe012abc604ca0b0555eaa0672470d20abfcd1c5197994327ae713fb4c
font_02_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 10844 bytes
SHA-256: c06750fddb2d9aad059b824a133177b20f3659a945b968e6b8d7964a739bf66a

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