Malicious PDF — malware analysis report

Static analysis result for SHA-256 d493a2f43142f8a3…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 23:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8e5241d91e199c8241319fced39cd801 SHA-1: 8e8e226049c61a501656cfc0345429c9b37870c8 SHA-256: d493a2f43142f8a35fe8734d748b24593ae20b25bdd7c52bd388db317df5033f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant heuristic firing identifying it as a link farm on disposable hosting, suggesting a tactic to distribute or obscure malicious content. The primary purpose appears to be directing users to a network of linked PDFs, potentially for SEO manipulation or to serve further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/f949ppgotcbnqtmqbkcars7987/kokabekaxo.pdf In PDF document text
    • http://vinhthuan.vn/upload/files/dewukivoverifikeke.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/23702716161.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/23143617457.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/zawajavilinobebilujebaj.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/xifofakafebi.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/1649449610.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/59466573010.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/ninasuvetenunedafivoz.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/79042852287.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210902045920136722crke9o.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/43568617957.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/97873992220.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/97167622593.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/62875317437.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/tevek.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/37399677217.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/72807105662.pdfIn PDF document text
    • http://retrofitoman.com/ckfinder/userfiles/files/nafojajamilusiw.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614328dc9008b---16477232761.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/79899782972.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/96754300521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=assistant+on+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_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 16700 bytes
SHA-256: 0b956882a532b02f43006d1f3426252eaa5497fb590fa65d217f11dc18329ba6
font_01_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 10044 bytes
SHA-256: 6202e8bb275030485a010f008565faa6423e7a6b16180e7dc552f502cc5a87eb

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