Malicious PDF — malware analysis report

Static analysis result for SHA-256 50639d20aba13797…

MALICIOUS

PDF

72.9 KB Created: 2021-06-03 02:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f64a98b10b2fc8ceb4a98d47df09bce7 SHA-1: 8fec10ea420212f165e043b1426bebdc856edb9b SHA-256: 50639d20aba1379763a89188e4efde90a57db191b0ecadd340d9a879e7943345
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://inwebjor.ru/pbw?utm_term=printable+coloring+pages+for+adults+quotes PDF link annotation
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/214557.pdfIn PDF document text
    • https://kaxunuruji.weebly.com/uploads/1/3/4/7/134725802/baef50.pdfIn PDF document text
    • https://nexonurobev.weebly.com/uploads/1/3/4/3/134371674/xolaso_zikulivado.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/kogodomaxedoku-fanofopoboze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fc59a6b70d2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_604146a69cb74.pdfIn PDF document text
    • https://rekasefuwe.weebly.com/uploads/1/3/0/9/130969231/gafupozogepuwam.pdfIn PDF document text
    • https://wivusogonelom.weebly.com/uploads/1/3/5/3/135310870/judaderitapeki_mezoji.pdfIn PDF document text
    • https://mixifotosipepe.weebly.com/uploads/1/3/4/8/134875306/19213df812.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/7b9962be.pdfIn PDF document text
    • https://warubeduzubam.weebly.com/uploads/1/3/5/2/135298611/9a3f02a7124148.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5ffd19f7238e4.pdfIn PDF document text
    • https://lewumirobubav.weebly.com/uploads/1/3/4/7/134762292/9497206.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/7f6d0a9.pdfIn PDF document text
    • https://wupifikuzokure.weebly.com/uploads/1/3/4/5/134529023/xitelelejejujutobufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_602994c8c72cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392860/normal_5fdb2f7b088db.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/22cc6aad-6348-405a-ba8c-6539ca8ca8cd/what_does_take_5_tablets_as_a_single_dose_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26371df-1b6a-4a0f-933f-cdd55a2cf168/best_manual_blood_pressure_monitor_for_home_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d594eb-d288-4bc7-904f-f046e5071b4e/computer_systems_analyst_salary_bls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d976b5-6b34-4eef-97b4-de1716b78e09/wisconsin_common_core_state_standards_education.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_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 5588 bytes
SHA-256: d71403097cf55272fd71803025fb44679d3629a3dc5cdb381d2831c5a7e85a7c
font_01_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 10396 bytes
SHA-256: 23434cbf4c4bf41dfe9a2abd8e69b3a5443bc87136394763504ab9ee7ae96d52