Malicious PDF — malware analysis report

Static analysis result for SHA-256 055369bc8e93315e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 09:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74173bdb02ab4ec95c4f07d2ee59c6bf SHA-1: 2f7152f6842814966274e871fa9a40f2e4c3843d SHA-256: 055369bc8e93315e7d5655d8c5b147f1a2de31f7845b647079b85b99c33087fd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to obfuscate malicious content or redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting an attempt to distribute or host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aiwcecckolkata.org/FCKeditor/file/49153522217.pdf In PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210913_0B26E8E8A4B1A931.pdfIn PDF document text
    • http://matras-devison.com/upload/file/35773563294.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/9099848240.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/15613790273.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/baxuzo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383ffa8cb58---24117489746.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/27582708830.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210908211136111.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/fezomigixuzeduku.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/94606330335.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/tolosajawibuwej.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/71714946126.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/tofexow.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/98778514698.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/14399578919.pdfIn PDF document text
    • https://okazionche.com/files/budeze.pdfIn PDF document text
    • https://linardi.ru/files/file/xekine.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/nabibuwesilexojulixilu.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/xakupil.pdfIn PDF document text
    • http://e5tbr2.alruaa.com/ckeditor-ckfinder-integration/uploads/files/retep.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/87494815301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=music+player+leopard+v7+mod+apkPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/7401932833.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_off0000d2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 19188 bytes
SHA-256: b8742c3ec0603d944e980414beac26a9fbd501cc2da89ae565f38bb362c8039d
font_02_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 10888 bytes
SHA-256: c6a54d98f4bbf0f8ca4d5e9380d4292dbce7063432750d9d31dc61cc321bfb26

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