Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c325d7da7bfc15e…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 16:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14c411abc68f915d7f5fbd8683064ac0 SHA-1: b9d9167ee84320a694242b970ba6ec8923ccd47d SHA-256: 5c325d7da7bfc15e7cfe2025ed84f64736211725dc273cec3df06e17182a79bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a strategy of using many distinct hosts for redirection. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://crewmak.ru/uplcv?utm_term=ispoofer+ios+pogo PDF link annotation
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/68465750221.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/sadagijojenilifibibirijil.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/jedowigemeji.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/17389200326.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/8636096446.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109151729538798.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/64862773930.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/6879336409.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/paxisumerivikipi.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/sukujuwejapukalel.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/lumuxi.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/87159180669.pdfIn PDF document text
    • https://anakmeong.com/contents/files/xigemuladadu.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/jolikolefav.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/pejov.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/7010222076.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/55338085312.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/vinidewuliwesevo.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/rabusemi.pdfIn PDF document text
    • http://baove24h.org/upload/files/98510455769.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f93414bb1---81494301156.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/gituda.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/6407538240.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/51946089188.pdfIn PDF document text
    • http://domosplast.hu/files/file/43777121536.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/tidoxapofukud.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/11481165213.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_off0000b202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB202 10072 bytes
SHA-256: af8b98082e4f72397947eac34576f5461ec5b1e1c234f28c72fe0c5f3a192190
font_01_sfnt_off0000c886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 14928 bytes
SHA-256: 985023a3b93cc9c59e7e5042d8cbe45b1e355d4353d2b31b8e81d8fcfc52224e