Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac8d10a4b06d020…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 08:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18d3a594b1de24a8845c5a4a9ec4925f SHA-1: f081fe6b0de215c064eca6cf1eff194019025844 SHA-256: 5ac8d10a4b06d0203da73fd0101b645635e70e7d537faf849fc40cfcda043d37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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 https://doluhosting.com/calisma2/files/uploads/gezepusiwamokesonotexel.pdf In PDF document text
    • http://pincodehub.in/userfiles/file/kotumerixexenikagina.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/97373637867.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/zezadosajus.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/42517111029.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/sotetibojerimuxolezeb.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/43715510550.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/nisobanudexavibimu.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/tiluwobo.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/39139626772.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/tufidezelinutafitini.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/78693359122.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/66661860696.pdfIn PDF document text
    • http://adveotec.com/img/file/zexasasixavilijasetujir.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fccddcab2f---pexulejibatitakadesekira.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/45574980543.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/76912728022.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/77218760397.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5dbe174ca---57069878385.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/53667107845.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/86939826677.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/59802076554.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/gumegivejoxarilodoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=offline+multiplayer+card+games+for+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_off0000d5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A3 11204 bytes
SHA-256: 4e3a4268422d30656e33644f360a68a3ac8c7219af121c71b4e6e9adec858fbe
font_01_sfnt_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 17244 bytes
SHA-256: 7d60c24ccfffa81c588050604b07cfc4300f4ce7b6382bfd85056a83f20e9aaf
font_02_sfnt_off00011c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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