Malicious PDF — malware analysis report

Static analysis result for SHA-256 f052cfb19f851cd9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-22 17:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d3ce0f8b2cef876fa5e2dd068f837a1f SHA-1: 2de55252f68b73b212e781fd4e0f0d99a0bef6b2 SHA-256: f052cfb19f851cd9e1526f90ea73ef3af529ccb27d4af18f26239ebfa8fe59a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to distribute malicious content or phish for credentials. The PDF structure and numerous external links are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://drafthe.ru/uplcv?utm_term=zen+pinball+full+apk+all+tables PDF link annotation
    • https://stephankeppel.com/userfiles/file/folej.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/jejodatotebuj.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/88045830076.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/pudar.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/bupevizuvopevejivegojasiw.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/8920378406.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/15657648635.pdfIn PDF document text
    • https://penzion-palice.cz/content/zemipola.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/xeketuketisanunoxilikanov.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/14468201267.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/78633685404.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/12704641429.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/87889723440.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f37cfdb2fa5d1d1e192e45f0c1c91e4/27083879197.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/15924323141.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/80302092778.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/zefiborekuranetudavo.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/sutozozuno.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/lenitemuzubitozoxuwagegot.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/54281683345.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/37561312325.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/91706485789.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/jelorefuta.pdfIn PDF document text
    • http://eternaseguros.net/files/files/84741975077.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/9a25803145544fd443bea0fdceb6af09/notivuriw.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/pivebon.pdfIn PDF document text
    • 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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 10424 bytes
SHA-256: 61fc2ec78199ae225fad22582418630b9b509089c23c741c18d729ddb154a69d
font_02_sfnt_off00010b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 17352 bytes
SHA-256: 316b1b7e77c360b54e6f126a3be4a9504b83d6b1a3c64f7172735ee2095b2306