Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2183148a818f682…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 17:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c53dc4f01938cff4397e059a166f6322 SHA-1: 684109fc2f93f814051931d57b47f8832c37579a SHA-256: d2183148a818f682385fef13a2a24d11fdb45ff67278b404e3858ec24c95b26a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://peoplehelppeople.net/uploads/File/59840347768.pdf In PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/juvilit.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/57046214022.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b85a149cdd---77874433556.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/batakibibupasesepufi.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/86291063594.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/dumuxaritiwijo.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/sosowo.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/dagasixizel.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/wipofebuvejajikametulapi.pdfIn PDF document text
    • http://elsped.hu/files/file/guxuzuriruxixizuz.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/tonufexeluxepagel.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090314570773499.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/tasazoponexela.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f5db8f676---jejesova.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/52435516779.pdfIn PDF document text
    • http://kawanmto.info/contents/files/manimanevare.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/44779768315.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/tovidijatogaxapagor.pdfIn PDF document text
    • http://mlead.net/images/e/file/72624470303.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/mujixevufomov.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/75688025011.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/dotalu.pdfIn PDF document text
    • http://beijingteye.com/upload/files/7764948107.pdfIn PDF document text
    • https://soechi.com/userfiles/file/9922912710.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/64139616036.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/gazisetapaxetobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tmnt+portal+power+2.3+apkPDF 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_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 10652 bytes
SHA-256: 692da77d15b1e360bc99aee8be8bba4f36184e1e7b28d3006b2973c158c287d4
font_01_sfnt_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 18136 bytes
SHA-256: 3cc9717508df6289f674bde17dbcca86419d9ec2a01bb1fff4ad0a19ff544120