Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c85386806fdf6d5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 19:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22c78f68cfb834e15f07a5d8b692856f SHA-1: 8ac4f3b7256a60cb8f814b37a44aae5c9c74113f SHA-256: 1c85386806fdf6d52809963bc2a4c870ba1f8e2c0c0a5a23688ab489e5e3522e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=can+you+control+a+samsung+tv+with+a+samsung+phone PDF link annotation
    • http://brava-ekb.ru/userfiles/file/mojowivosibirimar.pdfIn PDF document text
    • http://boxethai38.com/upload/file/vewofag.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/48413124363.pdfIn PDF document text
    • http://gekon.net/userfiles/file/tokedevifanoxal.pdfIn PDF document text
    • https://grandegroup.net/files/1631930120.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6969428bf763e072a3a468027c11eb40/76160313849.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/pemalanuzawitikuriranek.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/wolilujujebesijer.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/wozamu.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/noxonuvukopixusivezude.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/poleximixalebivixuwa.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/94971216601.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/95100048761.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/24114669698.pdfIn PDF document text
    • http://i-physiology.ru/upload/21691667894.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354efce71ad---49082289620.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/lobigelo.pdfIn PDF document text
    • http://vititanon.com/user_img/files/mupuxokawofejeximak.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/4186009485.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/74314194056.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-10/20210910034536253608.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/53258855461.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 18176 bytes
SHA-256: cdd6960d3f74685d6ffca7d310cb31985c54c3e3d49012880debb873f86590a5
font_01_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 11216 bytes
SHA-256: 9637ef61478658f801589752a46be610eb2b81686c7aa362bc617186d0c6fff8
font_02_sfnt_off00012532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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