Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48a0de02052e208…

MALICIOUS

PDF

78.6 KB Created: 2021-06-13 11:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c8197c29b8175430d78c63c1952b1f83 SHA-1: 553fb521ddd30e49ac5a0cb229cd4498527695e9 SHA-256: f48a0de02052e20887669579fdbebdb06547a00ec2e7d8c188479937199604f5
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links, with a primary URL pointing to 'crysiq.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a campaign to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crysiq.ru/pbw?utm_term=supply+and+demand+zone+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489244/normal_60305c47d334e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_6066d29e52fe9.pdfIn PDF document text
    • https://penelusoluko.weebly.com/uploads/1/3/4/6/134699361/jujigobewolusejagag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_602d3e96846d5.pdfIn PDF document text
    • https://fivefijoxiwu.weebly.com/uploads/1/3/1/4/131453543/bagiretatekan_vokuke_janipeketewen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_5fd0d61a10ee4.pdfIn PDF document text
    • https://magirodimape.weebly.com/uploads/1/3/1/6/131637482/1735606.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/wavut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_60c465e56b2c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_601ce1b951d2e.pdfIn PDF document text
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/fadunumosexewijigiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495846/normal_602c60904c5db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451754/normal_6053b595cf563.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e0f3e2b-3985-47e5-8c76-567c108e42cb/apc_back-ups_es_350_battery_replacement.pdfIn PDF document text
    • http://berilizi.pbworks.com/w/file/fetch/144894993/old_tamil_songs_1970_to_1980.pdfIn PDF document text
    • http://fubajulak.pbworks.com/f/monibopidanivi.pdfIn PDF document text
    • http://gobujirewod.pbworks.com/w/file/fetch/144720084/mizakutitunenedutetaxaba.pdfIn PDF document text
    • http://petapek.pbworks.com/f/the_handmaiden_sub_eng.pdfIn PDF document text
    • http://lukipuj.pbworks.com/w/file/fetch/144954552/76618676081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2776cebb-8d9d-4272-a710-f92197320839/stec_30_autopilot_installed_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b25d22a-f120-4514-ad22-ce0b4b3e7f86/nexepusator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/325f163a-e11f-4558-9a42-fe2af609c303/how_to_turn_off_furby_without_sleep_mask.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8259831-5448-4b1d-9b04-a442c8d930ed/repetojigesedireneg.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 5168 bytes
SHA-256: 300ab8d45a892425a5662df90dc86eaf19e52737dcf489bda1da13b8968e9283
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 10880 bytes
SHA-256: d0294a138e5e226f056725133ae64ba21aefef456180fc23b650ae62f5de38f0