Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ae5eb67a3ce02f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 19:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4ea0d678078f52cf6c2c6894dd0bb35 SHA-1: 4ae627a67fb2997e77a3ff9589f4ebe69697a9a9 SHA-256: b1ae5eb67a3ce02f2d8f1bad25dcbcf25f930845da6971f15283788a8052d3d2
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_CLICKFIX' heuristic suggests the document is designed to socially engineer the user into running a command, likely to download and execute a secondary payload from one of the embedded URLs. The presence of embedded JavaScript further supports the execution of malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://catamma.ru/uplcv?utm_term=unsupported+sd+card+fix+android PDF link annotation
    • https://artistprasanna.com/userfiles/file/pozuzazizovonafizotuj.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/jafisuwezapimevibez.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/degefupofarobeworun.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/9235012146.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/wopaselonimalexedinef.pdfIn PDF document text
    • http://bibikid.ru/upload/73434356210.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/xuveduwuvajuxovuwogasewot.pdfIn PDF document text
    • https://2acontractor.it/images/file/penumim.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/61878868956.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d36655e1cb904d708e339e30c615f843/zakatokawijodaguzomovibaj.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/bimisoromumavovodevawodom.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/69295555091.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/valegituzitifenaferuje.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/50350265507.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/tidogu.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/letikulobepuxofaj.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/10343618162.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/99204195700.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/lawutojelavif.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/41403295331.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/tunedebatokokifugenikonu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b96d4384d6---waxunaxisafawasoza.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_off0000d6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 10776 bytes
SHA-256: 7a03b31e7a4f12ccde16bcd16fdd25aec2ecaa1486a31501074745c431b8d342
font_01_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 18116 bytes
SHA-256: 1c049479c72ec347e02a120ed8ebb535313e4dafd6a5d13071ea6704c68e387a
font_02_sfnt_off00011ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1