Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cf8b40c253aa6d…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 01:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 041f7174956ad88490636719b3ecdd88 SHA-1: 30a5b663cf777478bfac251ac5bb7b11bfdd69ab SHA-256: 82cf8b40c253aa6db84af99a3eb7ae4fc05d713a9a42f4d7458e6072c91528cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to obscure the final destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct, low-reputation domains strongly suggest a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection indicate a malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://liga-stf.ru/i/upload/files/62216954986.pdf In PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/pawewosawifoxolez.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/lurasokewalotox.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/mujubemanifudiba.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/vanabodekomakufovemo.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/nuxokonab.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/26019101832.pdfIn PDF document text
    • http://askaudit.ru/price/87558128634.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/89441692968.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/mejerovakobuwijudusake.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/63143764600.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/76883287946.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/bigidiw.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/pawuvomuxiwididilebi.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/gipolakemusev.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ib55l13o9rm7jvf1u5u3g3vn8o/71591616228.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/d6c3aedac8e5d7c1fc52a6d2382359c9/gixolinavagitijilawa.pdfIn PDF document text
    • http://reylab.com/userfiles/file/mibewobirurizo.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/barotozuwipisisaginaw.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/xemajaduwosife.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/wavizadazuxeladamemesaru.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109131050334982.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210920081642_69ww1x.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+free+dns+for+androidPDF link annotation
    • 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_off0000ad4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4E 15360 bytes
SHA-256: 772ecb93ce2768904a3990f44d14ea0c4915e90fdb94985015f11c8ac8bb82ac
font_01_sfnt_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 10352 bytes
SHA-256: 72936e3baedcf68b9a026a8dac7497bf9a28c6bbcce15e38c636043fc22d9c1b
font_02_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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