Malicious PDF — malware analysis report

Static analysis result for SHA-256 7433481ecbbf8beb…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 03:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 589b7eeedf015c0f18108f6b589843a9 SHA-1: b78e0e0c760d953b534b7a6bfa137d85e50f9720 SHA-256: 7433481ecbbf8bebd6b6aa81c898dba98799bb0f092a687b13dd96065788185b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF's structure as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://maintogelonline2.org/contents/files/dosewevitufirizetemavuk.pdf In PDF document text
    • https://cheeselicious.net/UserFiles/file/68664645073.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc48510ad4---wopatexetudodegu.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/91444067252.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/98159836993.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/dabuzofagalabigufetabarav.pdfIn PDF document text
    • https://baongochoa.com/upload/file/64719813011.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/kuwovefovexenifefidifo.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/26033335021.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/39466289393.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/48234489935.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613477dc788f3---66730854941.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/59462924986.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/4782403882.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/boxerepa.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/suduzafirovifikelosimifa.pdfIn PDF document text
    • https://quizai.com/uploads/files/61256992476.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/71471005921.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/67843742675.pdfIn PDF document text
    • https://interconformity.ro/images/file/1661162755.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/47444379937.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/3916123376.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/jukutukijajore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=my+hotspot+is+not+working+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_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 10776 bytes
SHA-256: 7b13d1a1c1782fef73b1456b7874e05cfa74c8d0a177f44a72aa3c836218a76e
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001149e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149E 18380 bytes
SHA-256: bd30961d961a249c196c97b1fab2d8aeea011f7a2af6327a79140a68a7792a42