Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f22625a7f22f0a…

MALICIOUS

PDF

93.9 KB Created: 2021-09-12 04:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af513935b93faace5d5b1b51982fa727 SHA-1: 6309fb6e10e7291aff4e5a42b3676157c6c738e5 SHA-256: 66f22625a7f22f0a16e0e32ebc5d96e84d228e49975451716ab169e567575b99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=ip+spoofer+apk PDF link annotation
    • http://cssh.es/img/file/18311694030.pdfIn PDF document text
    • http://mextro.de/upload/files/4172917092.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/69057264078.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/93220375694.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/10340665977.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/banitijeben.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/vuzivoturemivulawolafim.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/48965061283.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210905023820079.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/15281260990.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/toparomoxumorax.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/78225996571.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e0e79dec---64265118951.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/damusinulevoburidadopi.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/17825226605.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/99003472801.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/nagewesimusewisejitupuba.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/94991526093.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/51291614062.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/vufotafudodu.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/32459609553.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-5/20210905195728759764.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/kobedudetu.pdfIn PDF document text
    • http://sswjeans.com/files/54108859508.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fd5cb738158defcdf05e13d2209ab624/redisitozer.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_off00010b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 10052 bytes
SHA-256: 342d0f790a68bf6bfa585a3367d9e829a32dee157786fd5aa9ca47ad17631b8d
font_01_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 18432 bytes
SHA-256: 0e73240f19450eb9c9215c9b65782007a24089747f7a63ddd2458cd601f76fbf
font_02_sfnt_off0001522c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1522C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1