Malicious PDF — malware analysis report

Static analysis result for SHA-256 500924b8fb8db18d…

MALICIOUS

PDF

83.9 KB Created: 2021-06-13 02:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b7804a063fe5fc0f9e83936b4339c693 SHA-1: 30a50b6b7e827d8a942b02a1bd5dd9846423d396 SHA-256: 500924b8fb8db18d524fb51d340191bcdf0cced7269595b888c348a4e2df2429
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or SEO spam campaign. 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 heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=foto+merry+christmas+and+happy+new+year PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379035/normal_5fc74971c3dd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_606a611b4ec2d.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/mazonobojo-mevewased-xosiwuv-boguxedeju.pdfIn PDF document text
    • https://jisiresofuwidi.weebly.com/uploads/1/3/0/7/130739297/gevukudubenuwetununo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_6010efb6ec1ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457847/normal_60248477c080a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_6044d6d5078e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497697/normal_5fe70c5cbcb80.pdfIn PDF document text
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/gewukunejuwuziwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_600d2d2445316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445731/normal_600d2491efbde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_60510e02eb115.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4468843/normal_60b5c3dba8e16.pdfIn PDF document text
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/1337352.pdfIn PDF document text
    • https://mazefitarunakur.weebly.com/uploads/1/3/1/4/131453858/b1592a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tirotibixup.pbworks.com/w/file/fetch/144618945/19491113543.pdfIn PDF document text
    • http://pozapagula.pbworks.com/f/lepizarejak.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/how_to_install_safety_1st_grow_and_go_car_seat_front_facing.pdfIn PDF document text
    • http://sawebaz.pbworks.com/w/file/fetch/145184832/relozum.pdfIn PDF document text
    • http://lumoxag.pbworks.com/w/file/fetch/144696801/buximo.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_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 5432 bytes
SHA-256: 9aa887a5b82aaaae0199b0e826618a6839baa16ee86f9d12d37ab1a74694b7f8
font_01_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 1936 bytes
SHA-256: 73983ccd477f0e4c07634362c0f9f13a23cea415a26bff37f7f125d59a681190
font_02_sfnt_off00011ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 11456 bytes
SHA-256: f522f067bba12ad8996a0a1c41a491e409f719abf43e143384d37388141f4576