Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8c563db5722054…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 17:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3f5096cea7a72ac3bebd0af2fdbf4500 SHA-1: d99988fc0cccfc3909c4f9ab12d367be52f3be94 SHA-256: 8e8c563db572205486aa229d2d74c855ceded8eff9c62f1f61e2c34ea9f39138
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'chcial.ru' with a 'free download' term, suggesting a phishing or malware lure. The PDF structure and embedded links indicate it's part of a link farm, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=incredibox+free+download+apk PDF link annotation
    • http://zhuxintrading.com/uploads/ckfinder/files/20210905/16307756154621.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/13795165458.pdfIn PDF document text
    • http://cbstav.cz/file/tonoxubuponetakulifu.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/jivomogu.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/pimiserokijuzedazox.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/98074345251.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/polig.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/3063430597.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/61214713151.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/55413980237.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/rimobelojimolelofigan.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/rujejedapodolimut.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/pke7bf2cn6otndsl7ec6ra9nqj/suzazitosepujivi.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/45991029634.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/7h6jduvfs1ogj5056njbog5df6/55968169285.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/vixovikanonisanewokebo.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/46079041583.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/66415811767.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/wewojowerivufezutojud.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/65807946254.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/ledabivadelexoxixav.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/25787004527.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_off0000d35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 10720 bytes
SHA-256: be7e3142ac1c12124560ed90a468131583ebd0377d040cb4468fb603ee7febac
font_02_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 17868 bytes
SHA-256: 5bd0bcb748fbbc307697314ea87dd805901a48f2e825eb7674d29e223f63ac9f

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