Malicious PDF — malware analysis report

Static analysis result for SHA-256 df60c83f40cd38da…

MALICIOUS

PDF

88.7 KB Created: 2021-09-17 10:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28279aca2b1babc93386dbdef00de3fd SHA-1: e9497e19653e97cab2fd3021a529f15133195780 SHA-256: df60c83f40cd38dadba9c0012e2e5d2c2e71b247d1ff03b908fab3d4535e78e8
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically flagged it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest it is likely used as a lure to direct users to malicious websites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ruiguoex.com/upfile/files/2021/09/17/situtaz.pdf In PDF document text
    • http://bangdientunhk.com/upload/files/wirefabew.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138402a7d46c---tenomibojivudosufularim.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/banixubogodafativevava.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/11553293042.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/10758406903.pdfIn PDF document text
    • https://sealskinz.ru/files/file/4623522977.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/talotalivuvumisejosini.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/fafilofevirab.pdfIn PDF document text
    • https://istanajp2.com/contents/files/58603673696.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/88928556881.pdfIn PDF document text
    • https://limsurdua.com/contents/files/5019616258.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/zadigebepinabopagun.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210914_EBF202D29C3749A0.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/94245f3a41f04088d6ae83df5b1778db/bunul.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/97325613324.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/kebosabakefezoxebemiju.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/nopipavanarigov.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/34449489556.pdfIn PDF document text
    • http://sunway.me/uploads/file/152156053947.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/zogubomesiduno.pdfIn PDF document text
    • http://katachizu.com/img/news/files/vunexulazoji.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210912011920.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/wifaz.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/sogizivijoxakozaseviv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=toilet+ek+prem+katha+full+movie+downloadPDF 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_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 10904 bytes
SHA-256: 40dc621b02c8a93dcca351ddbffdf9209694e27a8bea5305b5b78dc89f14676f
font_02_sfnt_off000123ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AE 19160 bytes
SHA-256: 9ce6c6ded6bb9faa525e6b2ec394210b2f5fbf65f4dfab9bae85b055b8e251e0