Malicious PDF — malware analysis report

Static analysis result for SHA-256 c611b01532da01e0…

MALICIOUS

PDF

75.5 KB Created: 2021-06-09 03:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c5d777ec1f901673a0123ca4d86a420e SHA-1: 3dccaeb62dc898b3aa832fc055f4d8b39a098e7a SHA-256: c611b01532da01e0132c397ccbc237e225dae1bf75f8497e30918f6832494d15
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/pbw?utm_term=online+video+download+from+insta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427295/normal_60bd43fcdad61.pdfIn PDF document text
    • https://barijenevedi.weebly.com/uploads/1/3/1/4/131438420/9400739.pdfIn PDF document text
    • https://kagepumesafoke.weebly.com/uploads/1/3/4/8/134846889/211348ac9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_60224c5004fa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489244/normal_601e4edf4556a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_604d3402cfee5.pdfIn PDF document text
    • https://vikilegopufuber.weebly.com/uploads/1/3/4/5/134588451/rutipof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475577/normal_602fb8c955f2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410695/normal_604b4d9a0bcff.pdfIn PDF document text
    • https://paruralevefux.weebly.com/uploads/1/3/0/7/130775474/b39e1a60.pdfIn PDF document text
    • https://fonomekaleguv.weebly.com/uploads/1/3/5/3/135308628/2ae2e74ce0a.pdfIn PDF document text
    • https://miwidikanizi.weebly.com/uploads/1/3/4/0/134016908/kabubowabarodera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_605c5a970792d.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/7834858.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://xuvabufoj.pbworks.com/w/file/fetch/144826917/ruzaz.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/f/15751628875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b019cf-8fa5-492a-9311-34b712559023/nintendo_wifi_error_code_51330.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144499869/tirerezotaridusuruti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c37b12b-64d2-495c-8727-bbff6747d1c9/47082261791.pdfIn PDF document text
    • http://rimogeto.pbworks.com/w/file/fetch/144580071/video_calling_app_for_pc_windows_10_download.pdfIn PDF document text
    • http://mofarires.pbworks.com/w/file/fetch/144897831/find_the_surface_area_and_volume_of_a_rectangular_prism.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 5020 bytes
SHA-256: f78691f82625e96b71bfe3259b8d6fecd7070fd1aa531d5a76e95e028e212ab3
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 10232 bytes
SHA-256: 5b2ab99b76efc2624d3477898949fde47887d2b6d3d5ca7bbe3fbedc83101af6
font_02_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e