Malicious PDF — malware analysis report

Static analysis result for SHA-256 83620457704480bd…

MALICIOUS

PDF

67.7 KB Created: 2021-09-29 11:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 936c465f756f17c429f987dd38a4ae47 SHA-1: b507ebf162cccaf8ac724b291ad98a23ea08abc0 SHA-256: 83620457704480bdf1e7c272390dd9b52b31ae7764fe46287eb474d70374ea2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://nationalcoopadvisors.com/userfiles/files/69425285912.pdf In PDF document text
    • http://gnatowski.pl/attachments/file/butuvimuxojugiw.pdfIn PDF document text
    • http://brlairport.com/images/file/51215668139.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/10313630634.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/27826647053.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/kezosikuxukakuxujozobu.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/mufebatitunabepazukoso.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/24400960644.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/kemimubevopixagaxinabupoj.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/daminefami.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/39734676268.pdfIn PDF document text
    • https://rotitelor.com/contents/files/53995368434.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/52139141985.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc25deb7b5---baturigelalok.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/bosepidipo.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/29618736976.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/23702716161.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/15844325748.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/vikap.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/76964505108.pdfIn PDF document text
    • http://precisao.org/files/files/43528163842.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/34094317783.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/ketov.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/22093438290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+17+dbz+superPDF 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_off0000adc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC5 10464 bytes
SHA-256: e0469b6fecfeda8c14aba1b3c33f477177c6ac8f225e3ecb691802ee16c28756
font_01_sfnt_off0000c57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57E 14432 bytes
SHA-256: 46d9b49e171193a6b3c74ae65d571d426fafdb6ca06e6c4c02cc78870cbc8518
font_02_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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