Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25f38adb5b84242…

MALICIOUS

PDF

70.6 KB Created: 2021-10-12 00:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ed533748ccf60b7c813140a9a1629058 SHA-1: 8f054d836ce2c84000147fe22dbdf9919fe7a957 SHA-256: d25f38adb5b84242dba405f60c64c003aa9f559e4474f908464579fc22580f43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://rm-parketi.si/uploads/76629287894.pdf In PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/92279139502.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/telajepal.pdfIn PDF document text
    • http://retrofotr.cz/files/file/30742310328.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/fuxelavatulemijanevipu.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/18152725987.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/9619578449.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/13367283569.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/21442161311.pdfIn PDF document text
    • http://jerevedefils.com/userfiles/file/sumajapup.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144dbf22dd17---zumuvemimuxejevusunu.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/61244150941.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/peguxeboroxufinurikutojid.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/wurewiju.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/dc6581313fd6e783e530497686a34ae3/bulegowe.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1632403299.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/16907534387.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/4204791132.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/75101908641.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/6353072590.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/fomutatiso.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/tgwjJlsMqHc/uplcv?utm_term=throw+in+facePDF 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_off0000b531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB531 16080 bytes
SHA-256: cdfb1f780310505c045798781d84a0e99a1e1dfc9e423f7ae253e81f1a7369a4
font_01_sfnt_off0000de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 10168 bytes
SHA-256: 9d3db9c5b392a0a5d6b4a4ee6036a381b2c3ef787f1298db85209b2cf2fad00a

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