Malicious PDF — malware analysis report

Static analysis result for SHA-256 289dea3a5d2c7fd2…

MALICIOUS

PDF

88.3 KB Created: 2021-09-10 05:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a38166e4fee2570c4b9b3fe4d3e06099 SHA-1: 4452e3b652c0561b5643eee615686b3875d65f41 SHA-256: 289dea3a5d2c7fd21da2f2653777305944b538d83b942f245b57b742cd752ea4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a likely attempt to manipulate search engine results or host malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggests it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://bm-shower.com/userfiles/files/bomovi.pdf In PDF document text
    • http://straub-online.ch/userfiles/files/mekagajelexitiwuti.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/liroxafudezizok.pdfIn PDF document text
    • http://ativn.com/upload/file/52628049867.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/63795344306.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/nudojiwapodujev.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/71862995460.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/menagulawatazi.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/32004442645.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136c78364a9c---73469312050.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/bomuwivesezo.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/96095981151.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/tagugeroregejudaxaleveba.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/kufopatifojaxinavufe.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6112a3d698d396251a45ab489b801f4b/newodiruzinaze.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/78551676757.pdfIn PDF document text
    • http://innotack.com/userfiles/files/tebadilanisamud.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/61087161200.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/sovekil.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nazepawimolutemowi.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/nukomukizaxowisig.pdfIn PDF document text
    • https://led7.ru/file/bufufegudivelonasaxur.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/bikudubusumisolibim.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16306435741329205178.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/losagazupuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+minecoins+for+free+2021PDF 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_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 18588 bytes
SHA-256: 33029433cfe3b5ab42f3dca186fb5ec1459dc845348bdb41f8a5a915e6b96cc2
font_01_sfnt_off000122ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC2 10844 bytes
SHA-256: 00afb3bd49cdbafd1b50661d30580d667d1f7fc3980a8d6eed98a4ab619de9c3