Malicious PDF — malware analysis report

Static analysis result for SHA-256 478ae0ae23df09a3…

MALICIOUS

PDF

73.5 KB Created: 2021-09-08 12:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa0e90e2c89ab005dac7fa1de3e10401 SHA-1: cf9213f18266273266587b87aa80116ad8abd7eb SHA-256: 478ae0ae23df09a3681986b9ab40361c32716f0699c26c40110a1449ff20b2e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=cns+tumors+pdf PDF link annotation
    • https://slotpt2.com/contents/files/sakenerasinurazinewumed.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/60997773528.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/geradekug.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/texuwadepisumazasal.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/26176696373.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/ziwiriba.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/rixukepufirapuzikurebe.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210905_99DB476776D9EEE0.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/14053244676.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/14977305445.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/lurexamovopetiv.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/16763394655.pdfIn PDF document text
    • https://cowik.pl/upload/92846391406.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/97771699723.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/kukamanaxexedukol.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/67125411801.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/gobizew.pdfIn PDF document text
    • http://keyday.ru/files/files/tozisafezulinoluta.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/e8cl6dik46l1aceu591ger4nu9/41633065614.pdfIn PDF document text
    • https://strechybenesov.cz/content/jafijevogewelunosonirowu.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/junuxi.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_off0000beae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 16648 bytes
SHA-256: 90ed3f8f9f89e8eed5b8d7e42d06028e68318b6595209128a2e17095bb7d82fa
font_01_sfnt_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 10356 bytes
SHA-256: 16615ecfcf24f1f2d50b270ba33f494f1f9dbac7def0528822d4f355d39dd54e
font_02_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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