Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca36ae56fc7c3fd…

MALICIOUS

PDF

95.7 KB Created: 2021-09-20 04:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b61ec4ad79a782cf835a0643da4b83d8 SHA-1: 3239d10e63413b79114f8fdc698dc05f584d3053 SHA-256: 9ca36ae56fc7c3fdaa5f5a6f352c30acbad25aaa0c599e8d19863d2c6e96f857
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The PDF's structure and embedded links suggest it is used as a lure to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://synerhu.ru/uplcv?utm_term=peter+rabbit+movie+2+release+date PDF link annotation
    • http://nsfeed.com/_UploadFile/Images/file/12930337222.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/66915923493.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/saritamamudevupepavak.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/84855861260.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/20317446751.pdfIn PDF document text
    • https://termoformat.md/img/files/21629298676.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/darafeduwu.pdfIn PDF document text
    • https://wonkingchina.com/d/files/16003548160.pdfIn PDF document text
    • http://e-district.org/userfiles/file/tugisegalar.pdfIn PDF document text
    • http://mobilenmr.com/files/files/11664359140.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/biwasuxetajemo.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/39114956198.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/zowaxekapijabijululizod.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/60227745303.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/rapudinujij.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bogajere.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/somasive.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/xakiwuzuza.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/dd818e9334790d94848cc450ba1656c2/90557172246.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/68859660727.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/xuxeribaxepipatorex.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d36655e1cb904d708e339e30c615f843/zakatokawijodaguzomovibaj.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/giminu.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_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 18952 bytes
SHA-256: a6565ddc4fbd33dcfc17c69dd8f4fa02e2befda9f4c4b8cc4400e9ecbb37ff40
font_02_sfnt_off0001585c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585C 10632 bytes
SHA-256: 06476f38d75d8f893120e28f2d5cab295dae973d003226fbda355f8e5264730b

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