Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db5c9194785ed07…

MALICIOUS

PDF

94.3 KB Created: 2021-04-03 23:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f855607b211338e518acddefd8c50fde SHA-1: 10131873a1f4b2624bc9b0bb635289b1e01ee0be SHA-256: 6db5c9194785ed07fcd28c46b5cdd8ecfb49327d7ac77446f4ef3678dcddeaf1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting or known redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to malicious redirector infrastructure. The ML classifier also strongly indicates maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its intended lure, but the presence of multiple links to potentially malicious sites suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=peinados+con+trenzas+paso+a+paso+para+cabello+corto In PDF document text
    • https://cdn.sqhk.co/wugunifikezu/hcLzjdJ/skipping_rope_near_me.pdfIn PDF document text
    • http://parovosi.mygamesonline.org/business_plan_template_for_a_non_profit_organization.pdfIn PDF document text
    • http://finansi-7.online/descargar_libro_larousse_gramatica_lengua_espaola_en_gratisi2001.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/gXhfiau/94183931379.pdfIn PDF document text
    • http://erkutungotu.com/server_2016_remote_desktop_services_manager_missingukuy4.pdfIn PDF document text
    • http://saudiautoinsurance.com/454281762375taol.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/ejanjdW/castle_hustle_hack.pdfIn PDF document text
    • http://gewebud.22web.org/xigibovijazota.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490371/normal_5fc7e78a338c6.pdfIn PDF document text
    • http://creditscorehelp.info/what_are_the_geometrical_shape_of_moleculesg4sp2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409258/normal_5ffbd765ea839.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenilu/jy9jchb/24184847216.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://naxogifesos.rf.gd/advocates_act_laws_of_kenya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be47cb71-d0a8-476f-8d43-4425fe2cb210/what_is_a_plan_in_project_management.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/los_juegos_del_hambre_libro_1_paginas.pdfIn PDF document text
    • http://kimoviranonaf.onlinewebshop.net/tintin_2020_agenda.pdfIn PDF document text
    • http://zerinamud.rf.gd/1152581456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79a39f88-afb5-4b04-b275-7b22f5519212/12818882648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b709fb9-7cf1-4723-ac8b-2ecb2bdecaac/zotexigixaganatozonomoro.pdfIn PDF document text
    • http://dasiwof.epizy.com/72628196595.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 5044 bytes
SHA-256: 2cab4735b72dd6598e4368944cb9c740ce3e33edfce417ee7837b61e2b9971b6
font_01_sfnt_off00012db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB3 2092 bytes
SHA-256: 6e5de5c6bcb7fdd8c5ca0d25823a8f80e6c764803c1b732dbc9c425a5c0f8ea5
font_02_sfnt_off00013759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13759 11040 bytes
SHA-256: 799cdcaeda72fc8a53e06cbd522643b2eb3d39553d33f305fda9802e76a0d943
font_03_sfnt_off00015b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B05 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3