Malicious PDF — malware analysis report

Static analysis result for SHA-256 52eee0a3e3d746b8…

MALICIOUS

PDF

72.5 KB Created: 2021-09-18 20:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 854a109a6302cc9b0209ccd2c82726f5 SHA-1: 1c4e9828b56c01122ee40d0a79240a90c39f1fad SHA-256: 52eee0a3e3d746b864898725bccd7b703bf3ce9b8637c0bff7a1e3c2a09e916d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by multiple heuristics, including ML and ClamAV, as malicious and potentially phishing-related. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests an attempt to create a link farm for SEO manipulation or to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a strong likelihood of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://elitk.ru/_files/83373176943.pdf In PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/61459408754.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/tufaxej.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/72514049214.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/84844122971.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/vofefusujibisodagubu.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/4785307121.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/jagif.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/kofegevivu.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/50378710302.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/rupoxuxu.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/42466962833.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/zujogagimotevo.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/phkahmbm91aiq8ncc7cnvop2u4/36540010203.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/kitivi.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/7597957867.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/79394522779.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/kulaporudutafirifaf.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/gipewibipix.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/lojapivabujozaxajo.pdfIn PDF document text
    • http://usmleworkout.com/files/file/75795258662.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/xovitedo.pdfIn PDF document text
    • http://vladekoservis.ru/files/mazowuseli.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/fumidilokup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=la+etica+explicada+a+todo+el+mundo+pdfPDF 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_off0000b8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F7 10672 bytes
SHA-256: d3b7ae341c90d21e37e534339360e03b54a5c3e185e859bbc8f87f760e9857d1
font_01_sfnt_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 16956 bytes
SHA-256: 59e380b798bfbb4ac24713f38da9f420e6b0a96c14d4cde804b48fe2900c5ca9
font_02_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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