Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6936a03f259dae9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 02:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: f86e9c964eaeb6e194489f98555f47ea SHA-1: b6486a227a14a714ac2f9f533ecb475db5093be5 SHA-256: d6936a03f259dae95bc1356a61fdc4baaf06fa5c813d28f51947eb04006d4aab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://un7un9b3rl1pa7-99.com/contents/files/tuwiwex.pdf In PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fikujapediw.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/5227535551.pdfIn PDF document text
    • http://indexone.ru/upload/file/83649596110.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/14621696210.pdfIn PDF document text
    • http://llux.vn/uploads/files/72168494429.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae93107cc---mutis.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/mutofotumivalosalokaku.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/rerudulubabul.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/096bfb08409d88704f0857586b1a2f35/8981867480.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/joginamodokonodolur.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/41432533256.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/81090056970.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/lasalajinunatej.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/texojukorawonuneve.pdfIn PDF document text
    • http://wjcopy.com/upload/files/17918902365.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/ginis.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/wamosejuxoverewutarux.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/piradoboruset.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/tuginidigatudiwomikat.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/32083841817.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/37585322223.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/fozus.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/89802504751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=solve+for+x+angles+calculatorPDF 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_off0000af07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF07 15600 bytes
SHA-256: d8be5f8efcd0315576f14af914365c2265432b94ac11dc5024f9ed0825dfe132
font_01_sfnt_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 10760 bytes
SHA-256: 307cab49f75f61594cf850414fea4d43d819972ce7d93167b4a291e22c4536b3
font_02_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1