Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ecebb297bfcc68…

MALICIOUS

PDF

95.7 KB Created: 2021-03-12 03:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3c1181eb85c4a2b115acfbfc5f28c6c4 SHA-1: f0439262446eb3e9402943d9c0026ed167057416 SHA-256: 61ecebb297bfcc68e6746a058e6a24e9f3672c192bfe9e359843161ea5286e12
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://midufefew.ru/strik?utm_term=contrato+de+arrendamiento+de+vivienda+sencillo+para+llenar PDF link annotation
    • https://cdn.sqhk.co/wexifidobafo/mmPTjbJ/35020278590.pdfIn PDF document text
    • http://zuvels.xyz/margin_of_safety_calculatorc2l94.pdfIn PDF document text
    • http://lyudi23.ru/kunavogojenewiwuretiihreu.pdfIn PDF document text
    • http://cashtanks.fun/mathematics_with_applications_11th_edition_freeakiht.pdfIn PDF document text
    • http://insurancecarusa.com/codigo_ascii_acentos_portugues0pkmm.pdfIn PDF document text
    • http://kostlike.site/comptia_it_fundamentals_questions14qyf.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/how_to_convert_j_mol_to_kj_kg6bnbx.pdfIn PDF document text
    • http://clipshd.design/2012_toyota_camry_owners_manual34zcy.pdfIn PDF document text
    • http://changepass.online/ramagaxagumamevupufish7s0m.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/ihglojh/28961360059.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_c42d59bc17cc43a6b3c450fe75696ab7.pdf?index=trueIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_e234541724d740dd90da2f2c9e134019.pdf?index=trueIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_6957f3da2ae24912826d07448ac7c432.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_d2eace0edbc44b029eeda7452538c6e5.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_6495bcf0075a48239b5e78656d59a97a.pdf?index=trueIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_15c38f7fd0694c9397541a8aeeb7039a.pdf?index=trueIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_958ab96295ec4a5f957547ff1057d6d1.pdf?index=trueIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_9c7faa951a9141d489c5fc8d3d1653e0.pdf?index=trueIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_a6856aab42d44b58a57c84972a064020.pdf?index=trueIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_ecb9ab33aa164e66817c01b31b2ec8a5.pdf?index=trueIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_82f2c8427185409ea55ba33a043ac14f.pdf?index=trueIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_7c9f1909eca743a28468260f95cf35a0.pdf?index=trueIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_146435ea8ea8473281752f1ff4b15b5c.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 6744 bytes
SHA-256: 8187145963fbf8e0b7977f93bb9cbfc296fb812f6e2b6f40a3c8d31ca5a797a4
font_01_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 5184 bytes
SHA-256: 32aea2881191a23eecf6ace19bb3ada4f14df9cd21820900112c25b67c692974
font_02_sfnt_off0001269d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269D 3208 bytes
SHA-256: 6f614968ba51c51b1ae20c66a057a0064ebcce1ea578859ce52d1c0e9b4361ca
font_03_sfnt_off00013379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13379 11808 bytes
SHA-256: 36e6a1e751a43e094612908b0005fdbe01b0c6c5cfdc0a59dda3f9bac4dfd71b
font_04_sfnt_off0001596a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596A 16240 bytes
SHA-256: 178fd41e0a8bb56052b6696b9795ad14de7ad001f42801e3c8bff3ecb4289e22

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