Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef023f4b96e8d0b…

MALICIOUS

PDF

70.4 KB Created: 2021-10-05 06:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b9916c037b4b76f854f66147d9ef536c SHA-1: 270221083ea5bf908557f633f5a7ee655b101ac2 SHA-256: 3ef023f4b96e8d0bef3df63c85af043a14680c5fd9a43f4ae01d4e745d68ec5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The presence of multiple disposable hosts and UTM parameters suggests an attempt to obscure the final destination and track user engagement.

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://chayka-svg.ru/files/gotijusenirow.pdf In PDF document text
    • http://chamdure.com/DATA/files/92610656489.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/lixaroru.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/firuriwetuwonujusutujot.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/rezunofudisanid.pdfIn PDF document text
    • http://charontrade.hu/data/file/90609622051.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/vigiwi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/93292668978.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/63284506533.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/duxebe.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/rasimef.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/sojigamowotarejebeduluw.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/vubuvopofuzal.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/zudasopeno.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/57633506348.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/56811255612.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109202053229894.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/11168061208.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/16788988267.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/nikato.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/22454131200.pdfIn PDF document text
    • http://strap.sk/uploads/files/vizunenav.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/96858690013.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/gizabiwutabukum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=back+hurts+when+i+lay+flatPDF 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_off0000b4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD1 15316 bytes
SHA-256: 95f193ed2ff32b1b2a0c8952c77e80a2a71d133d26615958e8c1788b7b684aff
font_02_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 10760 bytes
SHA-256: c8e8c22a6455f95e432ffd6963b14edd17280246cc770d80256ee4a81e253e8c

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