Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d190dc4f2c0ecf…

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 18:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9bfa26fb360acb6f15e94b38e2de7735 SHA-1: 78a31d8c0868853bf27255687602d8fead985b32 SHA-256: 39d190dc4f2c0ecf4663e1192032da80da173faa04d8f73592b3f6d4d6a65926
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The file contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution attempt. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=tamil+magazines+online+pdf+free+download PDF link annotation
    • http://matrix-corporation.com/upfiles/editor/files/94789417359.pdfIn PDF document text
    • http://kahasat.cz/data/file/46296963114.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/kavupizorasogozilelevafe.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/60356234668.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/46941193882.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a914ea96a---41021879546.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/baxesutejojenabobigulote.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/95683707560.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/2481611372.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f73a5cdcf2---70949022732.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lewubigubevojetanev.pdfIn PDF document text
    • https://kmedebiyatgunleri.com/ckfinder/userfiles/files/wifazonokelula.pdfIn PDF document text
    • https://sapporopools.com/contents/files/vowoni.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/vabomepugi.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/detese.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/mesosefusuwadutinawinu.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/82838272805.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/89643962832.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/jaropetukewitefub.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wenexogusomix.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/91004210717.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/51262570778.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/54228001616.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/7883912977.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_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 16848 bytes
SHA-256: 0573e5aac4a5ad520bdc6814cf43347fc38ec59007c1a267f4faeda7f3ab613f
font_02_sfnt_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 10852 bytes
SHA-256: c66cd2281b32bb9048d854abcd28b408541413f836e04cf135956eb3343ab39e