Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0535c4d6a73b79e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 03:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f938241523e64dacc790e71b02acac60 SHA-1: 22a865874d0d606210452bea9b387c5787a1dd7b SHA-256: b0535c4d6a73b79e18dc8dec9fb49df166c63cf6a63ac9d9d0318263aa33f7f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and heuristic firings point towards it being used to redirect users to external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.findvoters.com/userfiles/file/65068915604.pdf In PDF document text
    • https://dynasty888.com/image/files/20210904_001151.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210913033018818.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/nesalomitoreni.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/74897729986.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/78077664931.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/23145921574.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/juwolesuwibixawifeja.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/larusezilun.pdfIn PDF document text
    • http://salt17.com/userfiles/files/sulidopomilixodozeze.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109111258109583.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/20702193129.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210918_CD63254BD490B365.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/lurufati.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/35427503166.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/fafezifiwex.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/jimebij.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614916e388dcb---29967882788.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109111150388010.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/kigeluzazodavewugivov.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/76925446264.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137e3d9554d3---porilegid.pdfIn PDF document text
    • https://dacola.com/upload/files/62297370049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=erase+data+from+lost+phonePDF 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_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 10656 bytes
SHA-256: 14159d0f3d54dd81affc2197617c7e1dfe4bb14c6006870c4d80ef55adcd155e
font_01_sfnt_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 17632 bytes
SHA-256: d76ed1e8c22e41eac1be7eda3ba0132cf9eb7dec3df6edbe78bb59c257457c04
font_02_sfnt_off00011f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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