Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadf25f3e6fa700b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 13:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2543d020c3587718f00dfd93ac1d2716 SHA-1: 0976325663f2358ce26a84e60ad19b83d0778df3 SHA-256: cadf25f3e6fa700b9cd9131a0939ba87c92f11c25f63bea97c888aca3b47a19e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are suspicious. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://zagazzo.com/userfiles/file/3702519239.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4accf793---77790958682.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/sanugemegoke.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/82856989222.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/23921492340.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/gekuxilinugedurosazimu.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210910004624.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xewig.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210906_5B167AED160DE825.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/90375265999.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/18239778013.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/52348822259.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mvmorcik7thjcgnc95fnk240jn/nanupoxabozadir.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/69667130467.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/61377995789.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/76382502048.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/bovibowebojopeki.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/99152394820.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/wesiwopatorenomebiwowabox.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/kozumimesusoliz.pdfIn PDF document text
    • http://telecycling.org/files/file/vijizale.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/potebis.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/21181465250.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/18841692772.pdfIn PDF document text
    • http://candientuvibra.com/images/file/vamugelum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fifa+2015+apk+downloadPDF 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_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 10576 bytes
SHA-256: 8a491309259519d32cced02f51cae89c45500519a889b748da14f804e6acfdb1
font_01_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 18496 bytes
SHA-256: cbba884ba0f137145deb0d87ff34d80a43e1917cbe700ecb357666c81e6eb5a9
font_02_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1