Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f8a821e8f0d69b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 17:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f545648b41a4b2b69f36dfcffa880129 SHA-1: 850ef263ea649b4c7473c4f9732db32c8a3a343e SHA-256: 85f8a821e8f0d69b0785bb3b523072f0097c735238a975fc7578837fbcc24490
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 hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=android+mediaplayer+service
    • https://archielectronics.com/userfiles/files/10789038315.pdf
    • http://kirakuramenandsushi.com/uploads/files/fadiwamumiwi.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/lidazikusixebula.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b83ad5ab5bcbac2910e93f733464356/buvakitu.pdf
    • https://vegas-shop.net/uploads/files/naduvon.pdf
    • http://metabolit-plus.ru/files/file/37223961281.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/zexeperovokanodunoxa.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/cf382772dbdccf6691660c2084661628/85328495435.pdf
    • https://peisheng.org/uploads/ckfiles/files/61446c2ac8a48.pdf
    • http://watthaistuttgart.de/userfiles/file/80353682845.pdf
    • http://nilesk.com/userfiles/file/zixifaxapezulejodosuri.pdf
    • http://abwingssuffolk2.com/uploads/files/kugumebepizelila.pdf
    • https://pbpkrosno.com/fckfile/xiginub.pdf
    • http://consulcongress.it/uploads/assets/file/febimipinidutijoliruxuzun.pdf
    • http://mariautonoleggiomarsala.it/userfiles/files/jenelunojasakasukoxis.pdf
    • https://rybczewice.pl/userfiles/file/debukigagazinugudikemidi.pdf
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/64297174769.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/48086411906.pdf
    • http://casaperugia.fr/userfiles/file/80764868446.pdf
    • http://ei-windykacja.pl/upload/file/82094118825.pdf
    • http://tungalag.mn/userfiles/files/nerevakokowaju.pdf
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/tobilerebusigexan.pdf
    • http://biirbeh.mn/images/content/file/35032670000.pdf
    • http://law885995.com/upload/fckimages/file/65447970315.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d522.bin
badeb243bb523452ba7c2baa0b0568201ff61d1d500b44cc1f12b7c60db5ac16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 10736 bytes
font_01_sfnt_off0000edcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 16792 bytes
font_02_sfnt_off000105de.bin
3ca27ee509fa75d1d6679178705c2457acf7abc83f3ba856af9f7ffa9525cc1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 21176 bytes

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