Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2138c1dee049754…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 22:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48ae6059ba4f5278c73c7718cdb6af98 SHA-1: 1a2bb59dab4359a38799885a05fe1b704c891f62 SHA-256: d2138c1dee049754c8ee835a3b93ff01fad421bcc8b9ee0e364229cbb7380b4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded links pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it functions as a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=takashi+ninja+warrior+hack+apk+download PDF link annotation
    • https://machnik.net/ckfinder/userfiles/files/jepum.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210904184838349774.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d8f34cabc4dde70ec8b2dab45381979d/xurujexotaxikuxelilab.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/40977050979.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/wiwolabekeravo.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/54215423429.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/13490870777.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/pozavalojajiw.pdfIn PDF document text
    • http://freestyler.cz/img/file/namagasixusurarad.pdfIn PDF document text
    • http://anpharma.net/upload/files/97071557396.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/vofiwuxilubunuwolenuwala.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/77547668089.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/zipudixuwidumusixodif.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/86145977873.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/34387738266.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/16199558030.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/44695951286.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/47555921269.pdfIn PDF document text
    • http://wernitznigg.at/files/62755210940.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/50025ddb3504a99097ccd16acf7d9a03/70337193753.pdfIn PDF document text
    • https://cargobull.cz/res/file/defimudufunazi.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/gepowanepokanufetiv.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/98273817504.pdfIn PDF document text
    • https://dyaa.club/uploads/file/99234442821.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_off0000bfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD6 18104 bytes
SHA-256: c4f42e8b320835145bb3c0100efc416e8c81427ca09ec41384482bc5dc6099d3
font_01_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 10652 bytes
SHA-256: bd58590853bdc4e40427ef78550b72ebdd7de6398eb1cecd41604ec0b3feb1d6
font_02_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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