Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb35706d014e5be…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 09:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5769fe77dffab518d502f9e96c9bc7c8 SHA-1: 6183b0f224b18cfaf2db3736afd6860eafeee98a SHA-256: 5eb35706d014e5beec26d7d6cfca03d5c5cd2357bd9390e12a4d3b63f2de1635
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=8+ball+pooling PDF link annotation
    • http://eva.am/files/e2abc7db759612c9.pdfIn PDF document text
    • http://demo-calson.garment-pro.com/ckfinder/userfiles/files/verojewaxikinanozob.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/60129740150.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9983559c0ea87360f80556c034e8808d/gipizawadefagena.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/kegonefudorusew.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/legujejezijuvo.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/5414057106.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/malowikizifebapupup.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/90jscksqcutoh7k35pocfnjdbo/20186429976.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/wufusominisixebi.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/18167825317.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/12002062789.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/43425867444.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/73246825162.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/90097471122.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/41527304804.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/reseb.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/tixazasagajuputuwedebaju.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/zaxaxotosa.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/82172562645.pdfIn PDF document text
    • http://temple.mo/userfiles/file/49164745459.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/fumajajapen.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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 17004 bytes
SHA-256: e78d26ed74e3e33b5ca00d5eb8a4a12c3766786350d3c6a57134677dd8885da6
font_02_sfnt_off000119b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B4 10180 bytes
SHA-256: 06cdd6a221481c2623cf4da1439625e5e3b738b58cbf2bae5a2bc98cc50d1c25

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