Malicious PDF — malware analysis report

Static analysis result for SHA-256 4732e15c02a00ff1…

MALICIOUS

PDF

72.6 KB Created: 2021-09-08 13:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc56f896f984f1017714a08854c79463 SHA-1: 443e834a2ce46aed1fcd04d44f608afb3f1c6dfa SHA-256: 4732e15c02a00ff148d1e6bd0ccf0c4a81674af7efd882a17fbc52cc921eff76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=bank+account+transfer+letter+pdf PDF link annotation
    • https://granitabrasive.hu/editor_up/61926629626.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/25537075671.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/bekenolugetopufivosu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333487011c0---boduworuvubobaj.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021921349312355.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/37653646810.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/42732929846.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/36646767928.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/8267664517.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/getasugomarulaseleder.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4436298629.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/97361863285.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/babatagiwosakewa.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/47f432d6904f4c0edbd2d68b74d8af7d/14053787088.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/misesutupezogowenowuba.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/19649302138.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/vesibedetujarujujutuwulax.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/88426443714.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/76036855148.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/tuvodo.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/61056278738.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/91108399599.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/84021985940.pdfIn PDF document text
    • http://119pump.net/d/files/taxip.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/vawuzagebegiwepowug.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_off0000bb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1F 10764 bytes
SHA-256: 761a4a26d6553405f598e2d221a89c973776220edea8c75f70a3d889232aed8b
font_01_sfnt_off0000d41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 15916 bytes
SHA-256: ed4fe47562ea96e08675eea948aaa19e22dc2cf5ee7f79ffadca0339356d937c
font_02_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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