Malicious PDF — malware analysis report

Static analysis result for SHA-256 8596d7191d9acef9…

MALICIOUS

PDF

82.4 KB Created: 2021-06-04 11:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 85b4e66221523fbecb8dc0f7ebc253e4 SHA-1: b82e9378deb0d1de9bb62ae84abf2614e02ce054 SHA-256: 8596d7191d9acef9f37b2d9c2fffc5597bb49962b622fe7547105105efb1c3ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The primary malicious URL identified is https://smidgel.ru/pbw, which is part of a campaign to lure users with fake download links. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/pbw?utm_term=download+watch+faces+for+huawei+watch+gt2 PDF link annotation
    • https://nitenativab.weebly.com/uploads/1/3/4/6/134698737/dikenip.pdfIn PDF document text
    • https://kebotufu.weebly.com/uploads/1/3/4/7/134735966/dujixo.pdfIn PDF document text
    • https://zojivevu.weebly.com/uploads/1/3/6/0/136090852/ac087d1df234.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sejuworepow.pbworks.com/w/file/fetch/144578277/mijelovadipodipotogalizut.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/pinemurogatogo.pdfIn PDF document text
    • http://jobagej.pbworks.com/w/file/fetch/144563964/kufekawuxol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2678c02-ce82-496b-acb1-3aee2cbce765/libro_de_historia_quinto_grado_pagina_162_y_163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95867a3-d614-468b-aebb-d52f9fc98aa5/ralutosixujewod.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144599889/46770399871.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144413187/80448249754.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/8358044884.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144561660/gekonumusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f60eb8-453a-43d5-b911-f039075aa390/kuzafafidorogoxalagaka.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144456816/nezilit.pdfIn PDF document text
    • http://fijinatuzut.pbworks.com/f/wawawixevubevifev.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/how_do_you_get_more_refund_tokens_in_league.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c84121b4-35c3-4ad1-8b4b-882d59642a17/how_do_i_reset_my_jeep_grand_cherokee_radio.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144418512/32413960523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f743072-7ba7-4ec5-97ba-072319e3f32d/algos_pve_fit_2020.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/lugadunobenizip.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/33363000004.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://scripts.sil.org/OFLIn 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_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 5504 bytes
SHA-256: 8dfeda25c4466330d4d73b71801badc58eeb73bd05ac19d4174e6a52eecd296f
font_01_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 11632 bytes
SHA-256: 2874549def7646ad4bb234a92c4b38a6149f54298984080edf962740a7e0a509
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 16208 bytes
SHA-256: fe139538347d724e6b27dab22ead91fbb1eb3470a850438049392072e7f85921