Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b36247557eb3845…

MALICIOUS

PDF

91.2 KB Created: 2021-09-16 17:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b27c24e5428eecc669e3990fd64f1cec SHA-1: 774fa577c2fb37b34baec5586af8c29743f7ac4c SHA-256: 0b36247557eb3845de034a113dcc6d8e20caaa679b367cc02fc6d8b6f7f7ec8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous external URLs are embedded within the document, suggesting a phishing or malware distribution attempt. The presence of these links and the overall detection profile strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=safe+mode+note+10+plus PDF link annotation
    • https://derfo.info/resimler/files/bexalutubumixelitu.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kukeripewiwajurozu.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/99894823043.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/mijilolufemag.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/1182467673.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/neruraxelafigesuf.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/pofamaxefofupitilefut.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/43751165197.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/85544198219.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/subiwijakosabexopevo.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/korudurifel.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/99204195700.pdfIn PDF document text
    • http://belloverde.net/emailer/file/76344847682.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210909100936.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa91dd24d7---xigetilafenawigisisa.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/rerona.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4dd5fd3d---68908202921.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/xidanagewobaxulosopusadal.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210909_04F3E03E73A8113D.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/wapujarezibaduwawujozi.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/51712379424.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/livexefadesaledufif.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/dakomurimulexibumono.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/42766647112.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_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 18176 bytes
SHA-256: 3b6af1aa6e70e6a645598310e546726527e54dc71f611790ae9528110cbb88aa
font_01_sfnt_off00012dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E6 10816 bytes
SHA-256: f91ddc1413366529d6927dfeb0eccd4fe81d3ed405cca4572bdecd3db001c3e2