Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c0b0a3ba9f5fe2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 12:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ae632d4064eec8f9c141133f1a5ef57 SHA-1: 831ca2f5b393f7692e1dcdd4b37481d4ebe13666 SHA-256: 88c0b0a3ba9f5fe20a5e59bdda37cd6dc2204294403a6f6a746ae3441fe340ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or distributing further malware. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pixomot.ru/uplcv?utm_term=nbr+material+meaning PDF link annotation
    • http://krr-nfe.com/suratnfe/UserFiles/File/43519361105.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/dafodetagabu.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///nepawanurojilominuro.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109081202443045.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/dikatebejamikezumanezof.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/33960870821.pdfIn PDF document text
    • http://orlickachata.cz/files/files/mafapevenamurotowip.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/35303144270.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402d52d1dc6---tixulusalitunobaxesefima.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/levolum.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/zeroxobitamagikemu.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/53738734930.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/34406983207.pdfIn PDF document text
    • http://kme-kme.cz/files/file/jiluxovadivegoxulugebat.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/nasoxuvuxojeki.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/10381226818.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/22521590116.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/60190812422.pdfIn PDF document text
    • https://digireg.si/upload/tokegeni.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/77929589602.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210908054458.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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 19328 bytes
SHA-256: f2c29e5586c0fd542bdc27291d8c3ba62e7bab3fd38efe55a0d990008519c9c9
font_01_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 10280 bytes
SHA-256: 3be268e0b7d042eedd3d723261f51de3c18540799f277039be39b5f39d711188
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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