Malicious PDF — malware analysis report

Static analysis result for SHA-256 a222c6d0bad802b5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 23:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 550225e59384c2ce5be20dc565770cbb SHA-1: acf6b16c1493c8f08ab7bdfed1e4ac7c56ffbb40 SHA-256: a222c6d0bad802b5d89baf74e99e9e5e0e8ac367bd06c760c23dbc4ce8a1b407
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=hearthstone+mobile+games+android PDF link annotation
    • https://dragonexpressml.com/userfiles/files/27287389623.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/larudinaran.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/60704187296.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/mijukunesozoperemesezod.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/7126168938.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/65029673169.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/lolawizevazojowugojugirib.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/25470122379.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-08-04-13-15-88.pdfIn PDF document text
    • http://www.og2c.com/images/file/67454240253.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/10800788773.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/kagotede.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/nusuripede.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/14182970026.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/16386223718.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/41365515750.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d335b1b35---56261562599.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a3a57952d---tuvejevoji.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/60353740042.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/xakobadazitufeki.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/3832891540.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/55259613979.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_off0000d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 10824 bytes
SHA-256: 7491bd70fe52d3c5a958f8233a9ab06ee845ddffcbf7ff046d70b9fe2f5843c0
font_01_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 17756 bytes
SHA-256: 3b3096ac4c9062d2e2c784705f9f87e29c6106f1ed09227d27c35c4d91e133a2

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