Malicious PDF — malware analysis report

Static analysis result for SHA-256 4674de4766aba638…

MALICIOUS

PDF

76.9 KB Created: 2021-05-22 01:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c79c7fc2a70486aa3701c31a3b554924 SHA-1: 1945a16e570e098a53cb96bbd249663dfd9c109f SHA-256: 4674de4766aba6382c806c5a65851a6843f1d6c1929820976473d624118852e7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=what+do+you+mean+by+aerated+lagoon PDF link annotation
    • https://mebedepubini.weebly.com/uploads/1/3/0/8/130813558/gejimim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421038/normal_602383ca622e4.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/bf1df51b631.pdfIn PDF document text
    • https://wujorimumoba.weebly.com/uploads/1/3/4/6/134676457/xaledaxofow_totilekodamu.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/fogunazezobonege.pdfIn PDF document text
    • https://regujume.weebly.com/uploads/1/3/4/3/134339948/7610858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_6058f88f89294.pdfIn PDF document text
    • https://jusatupu.weebly.com/uploads/1/3/4/6/134652681/5524869.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/c3d63516-05f1-40f5-ab4d-384bd98b2dfc/33720094947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f3802ab-c04d-4504-9083-2aa51f30bfc9/minecraft_mob_grinder_schematic_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87749aaf-32ba-4aa5-9158-c4eac53f79cb/giwogizaziwozepix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37098e31-71d6-4a3c-84cc-80142a7ac63b/how_much_should_i_pay_for_graphic_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02877df3-dfba-4afc-9767-17689f22094e/58793762557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed0f14ca-a7b6-4945-8488-74b4c1a18ff8/4_major_stages_of_mitosis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a22db3ee-7dd1-42de-8b0c-88f2b817b22a/gineja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0eb94b2-42a2-4347-bbc3-c4d698d5d9b6/gelatoxonomuzotux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee897058-39e9-4e4c-9c91-f78aa9947555/29943913671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98379937-9b83-4018-96c0-21876913f73b/english_101_classes_near_me.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_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 5316 bytes
SHA-256: 3efadaab8416f0c8d0919de9b0f19f4905ffcb3ca0d287b8421ee5bcb9f36d73
font_01_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 10900 bytes
SHA-256: b6de48108034fc418c9b41b30e2e560212e91bdb38f6dfc78d4a59d0da0d9448