Malicious PDF — malware analysis report

Static analysis result for SHA-256 01daec8e25546d04…

MALICIOUS

PDF

79.2 KB Created: 2021-09-28 19:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4106b6b7a36358c74135cf50993332cb SHA-1: f4724a1169a25b3b4f67625ccc9eb998ba8a2119 SHA-256: 01daec8e25546d0418c5791c0f8c433d90bd1af81303988adaeaf9bc28ad547d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. The primary purpose appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=stahov%C3%A1n%C3%AD+z+youtube+pro+android PDF link annotation
    • http://ambvetfanini.eu/userfiles/files/sakejafepalogagewizade.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/razixo.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/mazufokexi.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/pidifikuvazuxaga.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/wuxezukopa.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/73313674471.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/misewigemupejifaduvaxam.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/nofowozaz.pdfIn PDF document text
    • http://asid.rw/userfiles/file/koxugulajokivajekimes.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/xaxonerezafideran.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/lapibozijopajudibat.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/gozebivufe.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/21688084570.pdfIn PDF document text
    • http://4rrecycle.com/files/file/21933300594.pdfIn PDF document text
    • http://unibox.lv/files/text/30816127102.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/71682315746.pdfIn PDF document text
    • http://huiking.cn/uploads/file/050447243361.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/64197274412.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/97120894805.pdfIn PDF document text
    • http://raovat.coi.vn/uploads/userfiles/file/19678604701.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/silabinim.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7be421239---16508756966.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/moruvarijidolunolosidu.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/70517899368.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_off0000ceeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 17952 bytes
SHA-256: c7a18027b9e06bb3d02813458bacbed9b61491da0764ab8890f8001d8e3805cd
font_02_sfnt_off000113ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AE 11072 bytes
SHA-256: 3e3d8abc8967b9ea23b35ba65cfe2c5dac3b026954585821eeebe42d6c40e42f