Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb55a67d69cf327…

MALICIOUS

PDF

77.5 KB Created: 2021-09-20 08:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d82b71ba1fa4fc870a97882620ece91 SHA-1: 74f622b9b4822d8cbf9d34c16955daf7caf90dfb SHA-256: ccb55a67d69cf327f092f1ae917009e3215a8a59daa1024c14e5e131452837f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The PDF structure and embedded content suggest it is designed to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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=does+android+have+a+recycle+bin PDF link annotation
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/12069717618.pdfIn PDF document text
    • https://fond.ru/userfiles/file/70993337897.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/jekopumixadojudujerekuvuf.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/89812332099.pdfIn PDF document text
    • http://cf2sc.cn/userfiles/file/87619721656.pdfIn PDF document text
    • http://esistore.de/userfiles/file/48273162626.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/32bc481586c6d8183eadd3f3e9e869f4/rowafepi.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/sukunaloduwakutowif.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/piwasiwovisune.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/rutizemililijapo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614487e2457b8---29098693066.pdfIn PDF document text
    • https://ntc-container.com/upload/files/xesobisiva.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/98128527203.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/16961863974.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/80049083882.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/92061048089.pdfIn PDF document text
    • http://wawa757.com/uploads/files/42521470250.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/seluxixoxemigikabuvumug.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/kidewizufewix.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/gepezezaputuwikug.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/terilodavezivo.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_off0000cbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE4 17028 bytes
SHA-256: a66a9f21dcfbe053dfd984aaade4ab3a2ecd8a10beee1b53df68f5e2df5464bc
font_01_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 10688 bytes
SHA-256: 861dbfe93a9c7bc619ee3410e8c271acacbe521780f841d1b4e105f8781eca9d
font_02_sfnt_off0001106e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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