Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1ae77fe044a474…

MALICIOUS

PDF

102.5 KB Created: 2021-09-13 10:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1b1d0f915b426998535fd432ffb32a08 SHA-1: 6f7540fc11850ae3a2b16b2c6bf65fb32adc3dd5 SHA-256: db1ae77fe044a474884d7cfabd7ce8a0ae1c1202df8c940294115a459ad01b12
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=square+root+of+minus+1 PDF link annotation
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/59110559344.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/95151895785.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/43977374669.pdfIn PDF document text
    • http://superazs.ru/images/news/file/ganagogelifilu.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/nuxoxogil.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/pabosez.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/fefasutejogafaje.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/87856739153.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/buwilagovas.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/jipapesejitisilusu.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/fipesusafevu.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/17331491825.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/jedubaz.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5iuh0tkhu9sblugho7llo5fin0/99891483412.pdfIn PDF document text
    • http://llux.vn/uploads/files/jatikam.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/35795445864.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/35158414540.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/78578839946.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/63539357799.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/68543190171.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/rd3vilk6q3v101klo3mcufgarb/zanopamakuwuzij.pdfIn PDF document text
    • http://amkchem.com/upload/files/3062423354.pdfIn PDF document text
    • 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_off000127aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 10704 bytes
SHA-256: bdaa991647066958597dc379147117ff22a503dec44775e28fbf68c4960e162a
font_01_sfnt_off00014046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15858 20040 bytes
SHA-256: e2d3d1c4431f20dbd5964961e7f2861c5ec2ec84714e3717fe6eb8e810bfb488

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