Malicious PDF — malware analysis report

Static analysis result for SHA-256 f10b536be5529443…

MALICIOUS

PDF

86.2 KB Created: 2021-10-10 17:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fc43455000dc63dd3af8f8f94713e96e SHA-1: 925ea2c26345500e0380ad028c3b8c752cf006ce SHA-256: f10b536be55294438da8a3dd6027d9e4eb4bf874b545d9ae0f7b575f3172b559
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting. The PDF's structure and embedded URIs suggest it is intended to redirect users to potentially malicious websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://irlanc.ru/uplcv?utm_term=excessive+purring+in+cats PDF link annotation
    • http://heatherjansch.com/ckfinder/userfiles/files/zaxew.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/dokozozejedodilimov.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/boxujowerofi.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210924152428.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/92400664364.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614c38f315c91---42013848966.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1632555351.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/88918904202.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210923011005.pdfIn PDF document text
    • http://thedreams.cz/files/22771718930.pdfIn PDF document text
    • https://bawauang.com/contents/files/nemig.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/12645913648.pdfIn PDF document text
    • http://pskov.agisinfo.ru/uploads/content/files/mabidodatakuxolureto.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/76615837951.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/86214797815.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/22537421203.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/xulutoxepibegivikis.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/40214506242.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/47045612697.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/nunasufoxibalure.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/4142717820.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/tibasomurakoto.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_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 10636 bytes
SHA-256: 4f4b42a49151538b4a79cc4de3f77cfc884a2514cb1a200cbdd25841415a89d8
font_01_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 19268 bytes
SHA-256: 8a33b14956fc1a8bb3ad74d8ef39a07709cee790763b292eeefb6c2f8c492107

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