Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd854cc3d4e057b…

MALICIOUS

PDF

80.7 KB Created: 2021-04-06 22:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 02ce384548ff95d31545eb9072afb784 SHA-1: 8933b352cdabc32dab6099d2ca25fdc0655d1f41 SHA-256: fdd854cc3d4e057b41c70e1cbe338b9e5e303373e008eb4e9da3990dd051a39c
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 0.9964

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://kuzutuzo.ru/123?utm_term=ipcc+special+report+on+land+and+climate PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367305/normal_60021ed1c6384.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/hblgegd/19134315788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368495/normal_5ff8cd8cae9fd.pdfIn PDF document text
    • https://tufanemoxidubux.weebly.com/uploads/1/3/4/3/134315727/b18f22cd.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/arhakgf/discord_bot_add_role_js.pdfIn PDF document text
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/2570086.pdfIn PDF document text
    • https://folozulo.weebly.com/uploads/1/3/5/3/135351090/xobavajowuxepi-lezurej-tubok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_6050e2e23c7fa.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/LqWgfzo/dosudizewizurixutozar.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/jgsnxNN/xogal.pdfIn PDF document text
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/d4420fa1d3e17c5.pdfIn PDF document text
    • https://kujunegisim.weebly.com/uploads/1/3/1/3/131380440/4197154.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/7CZDMlB/swing_trading_for_dummies_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_9ce823ed344f4e31bbac1c8c4efb724e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1915f2c-a93b-4bb3-aea8-b6cb2f5af6c7/misepidogodiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e02547-20bc-485a-81f6-7e414ec8ed9b/95282775560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501f04b7-43f2-402d-be1f-3a0b8243c5ef/sign_of_the_beaver_book.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/melijoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69672bf5-6738-4844-9f21-e622b2fa6725/25239420501.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_50234e59b1ce4429a047a2fb852f0658.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxexi/75951071607.pdfIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_c29b214a146a4314b72b26984e7f7a25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/desaridetanikexemukuz.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/gebotaretimabiteti.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/lejura.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_f8efb8d9981143f6be16507ec93e1e96.pdf?index=trueIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_60ebe731143e4adcb606bde1fc5ca890.pdf?index=trueIn 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_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 5156 bytes
SHA-256: 782f944b048dcfd27a5be4f063b24a84d1375a2c100f0ab025665283150326bb
font_01_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 11064 bytes
SHA-256: f787f66fa1c059ec408e9c21ca1f9986d9ee41bba20164350438405d4642bbf9