Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a07be4a1a0740a3…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 02:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f58f1862f703f6f8e84d6b16be82ab15 SHA-1: 808284b84466fa77c82f7a8a7d4098e46a533df5 SHA-256: 7a07be4a1a0740a3eb1e07c732284d6b85877be150f32a80c14f72f6af458d51
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the primary purpose is to redirect users to potentially harmful websites, possibly for phishing or further malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=cast+tablet+to+chromecast PDF link annotation
    • http://nceed.kr/pds/userfiles/files/99555641961.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e8fe5b6edf3983df2f800d06281b1070/38790428025.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/76352267801.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/zevikof.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615249e3ab2e0---dinokemipibodepa.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/30260005421.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/moxofulasafonitebanolasan.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/medamafakavana.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/kubugorexobokezifoked.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/zadoburop.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/fijewalagojuwudojodas.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/zujopapavowoked.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/wurov.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/67624890335.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/pinesumotaza.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/nawodi.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/newige.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/82825938104.pdfIn PDF document text
    • https://ottopianos.nl/files/mapimejatujazuda.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/26685631130.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/81266229332.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/13273446536.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/74500729245.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/wedutabadada.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_off0000b01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01F 17600 bytes
SHA-256: 3bf467e1f600c1ede98751843b2f5663e177cf42190b8430c4fbc561d09d1fe3
font_01_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 10472 bytes
SHA-256: b9f8aa313172ac951c81f29df33c0af448e04696c2d4d6e289ddbbfdd87fe4fd
font_02_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1