Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcd3a71daf64de7…

MALICIOUS

PDF

83.7 KB Created: 2021-09-21 15:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63ec283af7233ce4d83fece261f65fa7 SHA-1: e650f643addbdeec99e4ae325173c262fb0e8141 SHA-256: bbcd3a71daf64de7fe8f7c66953431c0ef1e235f0637696d190ea9204253012c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URIs, including one pointing to a raw IP address, suggest a link farm or phishing attempt designed to redirect users to potentially harmful content. The PDF's structure and the presence of many links on disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tvoirostov.ru/ckfinder/userfiles/files/kadusarowuvenilojotaw.pdf In PDF document text
    • https://yennenga.org/business_school/uploads/file/58548910431.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/96135775205.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/vikamovetepis.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/38192493231.pdfIn PDF document text
    • https://skl68n15g-n2ox.com/contents/files/64973434881.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613662a9eb95f---busoveramexas.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/88865646824.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/kuvojebuzaxanuxogudilo.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210915_91885BA2A1A7D133.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/xitik.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/fibaxumeten.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/45798399865.pdfIn PDF document text
    • https://izometal.net/mm/file/1612552424.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/zivapas.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/4301515343.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/48410462125.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0f727939---satepefixol.pdfPDF link annotation
    • http://ducnhua.com/upload/files/supedinesizejepirijukijan.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/71822643500.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/wuvuxivikamo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54cc6f48d---58196719762.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/70221747666.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/28475923832.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/totavanepu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/86742744562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=illegal+film+streaming+sitesPDF 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_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 10388 bytes
SHA-256: 5ec85713aebf2017af9b1c06e8705a5e4ca68363946e6ec865cc7917fd9559f3
font_01_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 17600 bytes
SHA-256: 1d42e0054fd8c60e8000fddb6961c9e143d25ad71aa1e3e76229fa101aad185c
font_02_sfnt_off00012900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1