Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b91bad8ef13ac99…

MALICIOUS

PDF

85.5 KB Created: 2021-07-30 02:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e2b501f02baac9dcdee2d5d9d4efc29 SHA-1: 3560ee4aa05f45120cd765001c2e4f0ba5bddd2c SHA-256: 6b91bad8ef13ac99ab9962bf4d7aaf8ff4bbba0957e6db108ce5baea1ddef82f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and ML classification. It contains embedded JavaScript and a link farm pointing to compromised websites, with one URL specifically impersonating Facebook to lure users with a 'Roblox Robux promo codes hack' lure. The embedded JavaScript likely facilitates the redirection to malicious sites or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://catamma.ru/uplcv?utm_term=roblox+robux+promo+codes+hack.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=roblox+robux+promo+codes+hack PDF link annotation
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/62159417029.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/36594496511.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/topivesedaxeva.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/9587636828.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/lopunij.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/34547515802.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/92363157939.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3660c18df1---savokelegajusokaxufefurej.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/63634415759.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/roxogomexi.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de74851c3---gowozaxusomulinezagofiji.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/48419529531.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/raretoxoduxenagevem.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/b6f68a920f6e2269d91601911278d520/61757783494.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/49ja3jd9ni3l6baehru3j92i42/dagoxizuzusikanu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078578777588---88496968291.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/78767729676.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/23414623159.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_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 17324 bytes
SHA-256: a9a96bfd1069b0c2aa64933c59575a9560e7464d59d8fa3b1285f9e864751613
font_01_sfnt_off000116d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 10964 bytes
SHA-256: d70eff43b68d3f95d446809a645ee0b0bf9e143f2c926d60cabe9dbecd1e2173
font_02_sfnt_off00013025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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