Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33eb82fb9c4397f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 23:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13ffbf394d4a63a46ae93428a1184a19 SHA-1: 58467e6e6b6bfa87940b2362281c4da423e5a9f5 SHA-256: c33eb82fb9c4397ff92a33d9a2b0362c1bd3a9b6c434b3a8902e8ff036c1cd85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the PDF and the presence of external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jpind.pl/userfiles/file/177781383.pdf In PDF document text
    • https://mamotato.ro/userfiles/file/78010558772.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161436853bcab2---jimexugevujorotiwe.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-14/20210914153208156797.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/dagedumovamuzudot.pdfIn PDF document text
    • http://cartopack.be/Images/file/76567757490.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/97358700601.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/nebipisivofaso.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/61816231851.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/sedojeponofatajene.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/12868277209.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/28332083323.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/12324012859.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/nolakumo.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/59564828981.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210914061207.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/98378937775.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/vebomomoruleluzezav.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/2973857970.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/nipumosufume.pdfIn PDF document text
    • http://st03.it/userfiles/files/wopesud.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/zogenoluxovoz.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/67577884144.pdfIn PDF document text
    • https://spacio.hk/attachment/file/fogepifebinolod.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/wolojejiwipelib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bohemian+rhapsody+online+watchPDF 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_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 11032 bytes
SHA-256: 0b23502ee3d39c09baec9dc4915d9f587dfcd5056f4e9a55ff705307a709d87c
font_01_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 18500 bytes
SHA-256: c4e736a0be961e657e2f4bb514fc39902cd6578f51588aded6be5cf6e0605b46
font_02_sfnt_off00013036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1