Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21193444e15014c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 14:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15b6dc0fc56182b2dc06fd4514ccee84 SHA-1: a4c50558f926b16b7821f01c0fbd06f9800eed61 SHA-256: b21193444e15014c3a9b8a422821f1edc860a519e35a4e70469ad0a95c13b5a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous embedded URLs suggest a phishing or link-farming attack pattern. The primary goal appears to be directing users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://computer-rudolstadt.de/upload/file/20618509771.pdf In PDF document text
    • http://andlupa.com/userfiles/file/42734102716.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/50461118067.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/wijajofasekezurejakikos.pdfIn PDF document text
    • https://tonitomov.com/picture/file/puzojetexizuv.pdfIn PDF document text
    • http://healthywithhart.com/res/file/juzelobujes.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/11864612283.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/nimifesipetuba.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/pivamidofemalaxiv.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/tawojube.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/tunusepoj.pdfIn PDF document text
    • http://duef.ru/public/file/vuvuta.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/mibilakuxowolaninaruw.pdfIn PDF document text
    • https://mmszke.hu/files/file/bunemuwaxofe.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/dinepilojepozusuv.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109131736519876.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/87103396664.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/25722979597.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/kemodonakujufigajiga.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161416756ba752---12408847447.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/jigig.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/kaxonisa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8889e704b---79466305167.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/fewapuvalamizedapizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=boruto+volume+4+pdfPDF 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_off0000b825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB825 10428 bytes
SHA-256: d713ab44d130943870e462b184f4dad5ef9369be540be9c1d07b21427a749cb3
font_01_sfnt_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 16872 bytes
SHA-256: e29ca259abbd5bf94e912db0937e8b8adec41868bbf5a99266de964b2cac89d5