Malicious PDF — malware analysis report

Static analysis result for SHA-256 defd0d03c9b205f7…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 18:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9246caf0d362fbafa504782e1a2c598c SHA-1: a3c4727544b0047785ede1c010540b28e4df4573 SHA-256: defd0d03c9b205f72b8d1119d0f119ec6b04126969fadce72650a89943eb925c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external resources, suggesting it's part of a phishing or malware distribution scheme. The PDF structure and the presence of link farms further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://likeevent.it/writable/public/userfiles/file/3634950578.pdf In PDF document text
    • https://sthouseluxury.com/upload/files/57435678280.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/famubora.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/9358815598.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/nexekiwinojunosigofa.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/nezanuberub.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/gejezozusepinowidivup.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210914063329.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/vugeke.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/90908212371.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/luzula.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090513380773499.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/32f491ae7ec119c03c11c65e0e72d343/govojemipo.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/50643977841.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-14/20210914123845260008.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/3630546371.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/mojujowunuborutavewatu.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/jawexifikaginimapogez.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/88355625624.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd919f798---59653632166.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/kemomuxomijavulerutolon.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/todelopotorera.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/85381424967.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/rumupitefipukitevofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=max+payne+2+mod+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_off0000c6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C1 16932 bytes
SHA-256: 5363bd0810d21edbb927fc36213974d48c9c0a63ab9f168e8f863970ccf80635
font_01_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 10472 bytes
SHA-256: fbf2fbee12028e6951afeae7477ad22b2c4d49c381fc5b10b5a29a1e03e212ba
font_02_sfnt_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1