Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5298b1cea8cd196…

MALICIOUS

PDF

67.8 KB Created: 2021-09-13 04:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d2d0a3ec0d5ec2bdc05ca14d93b897d SHA-1: 945c8bf4c8ec894ec9ad18362dc8a8db931f585c SHA-256: e5298b1cea8cd19612bbeb05bfcdeb71cf23385e11ce23dedd6a22c4e2a9f3ae
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable link. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure suggests it's designed to redirect users to potentially malicious sites hosted on disposable domains, as indicated by the link farm heuristic.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://meble-tk.pl/userfiles/file/16802376683.pdf In PDF document text
    • http://sicilyontable.it/userfiles/files/nusajazisatul.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210907192708.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/bokinisajitubigiji.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/besuvabe.pdfIn PDF document text
    • http://preiss.at/upload_files/files/xukomalutagoxewasetuvoji.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/75101074952.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/63958506037.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/vubutadupuluf.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/89459656332.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/10725253809.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/movotefosikupunuzij.pdfIn PDF document text
    • http://ipllaser.in/uploads/27412086229.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132617f352ef---42546732008.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2decdcde---84555672005.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/japusejowimeronufivowef.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/gawuwebovupaforeregulu.pdfIn PDF document text
    • http://gabortech.com/admin/file/75035489805.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/vugofivoviwarufuvin.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/govonuxegogebafo.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109031157539362.pdfIn PDF document text
    • http://bptramptour.pl/files/file/newefidapi.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/14782228431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=christmas+canon+violin+sheet+musicPDF 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_off0000ad7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7D 13828 bytes
SHA-256: 1f838dddd8b8d6154b5209474312c7058e529aeb47d09f33b41ab51a5a84b063
font_01_sfnt_off0000cfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB7 10692 bytes
SHA-256: 5561b6f03d459a105a6d1fe9faec1c70e31d953894dbbf77a379995eae5f29de
font_02_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1