Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a456fbf398fae4d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 20:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a519458603cb0de33b93bf7940e4a658 SHA-1: 08d493b07268aa6d8b5f91038b76ee428aad352f SHA-256: 9a456fbf398fae4dee9b41df57d085aaf4be379f6b407e40113c95a01f41af94
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or are part of link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing unwanted content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=my+cafe+shop+cooking+game+mod+apk+download PDF link annotation
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ba55ba48afeb7afcea9bd612c6be8fc4/favujelisobusufejejuj.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/muzalebininoluve.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/64561297171.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/52848190583.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/dutejamafiro.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/8668555379.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/dunuxijagezat.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/bamujibivege.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/73635599401.pdfIn PDF document text
    • http://afslab.asia/upload/files/safineselimav.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/gujopivijajumil.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/duvukinejoxufi.pdfIn PDF document text
    • https://fobh.net/userfiles/files/felewapagakituza.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd755ead29---88816570342.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/66895132574.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/tinagag.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/rawotagoxos.pdfIn PDF document text
    • http://npas.ru/pic/file/mutatasavut.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/14810456209.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/89761408253.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/62392984269.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/pilaxo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613991fd9f6a7---vagozasevonijafar.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_off0000b181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB181 16028 bytes
SHA-256: d2ce9660ea07d23874b6dd00484ca9c765be0608ba0c1b25945aaa6dffe57f4f
font_01_sfnt_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 11156 bytes
SHA-256: 48e8b58abec3a29b91bcce03f8f5c75e4536dc2ab0103d3fdb6203a5d397346a