Malicious PDF — malware analysis report

Static analysis result for SHA-256 242c5fb2de03fee1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 00:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9d1331dc88cc0df1960b52035362690f SHA-1: 041955dc8f6d0e9646a8e0623cae1f79c34ade3c SHA-256: 242c5fb2de03fee103cb29269ce06df0107bcaf39cb31c486791acb17d63ad71
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kop-trans.pl/uploads/userfiles/files/papusidogopusulemar.pdf In PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/43590675438.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/wokegube.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/36231418779.pdfIn PDF document text
    • http://lukinserv.hu/file/nelividudaravukaritij.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/45320901397.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/xaregarisuwujibe.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/totidadefewajenolagurefum.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/wuxivo.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/bejijuweboriwagu.pdfIn PDF document text
    • https://izr.fr/files/34730449645.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/96305003060.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021921314399629.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613050d6946a4---32092653927.pdfIn PDF document text
    • http://erimti.com/userfiles/file/73490504386.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/jekezexekogira.pdfIn PDF document text
    • https://emmaushuis.org/pages/60771028151.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/55846892589.pdfIn PDF document text
    • http://letdentalab.com/img/files/nanuwuturemigovejebelukep.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/86425680333.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/mumupowejuxasediz.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/47550994290.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/kolog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=watch+no+time+to+die+online+freePDF 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_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 10568 bytes
SHA-256: 5c09d6f70fa176d79dca843923077e7bfa40f36a11c044ec2c1ddc203397794b
font_01_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 17904 bytes
SHA-256: b634619b9869164bada592b5d65be62ce9af05335f322a9fc2f9674b891b6aaf
font_02_sfnt_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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