Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5ceaae9992ff99…

MALICIOUS

PDF

90.3 KB Created: 2021-05-27 06:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b9881fd39029a2377deea2b2dda99e06 SHA-1: ca28d9efd7b65fe5d5ee5f1d7cba0c029619e52d SHA-256: de5ceaae9992ff99f061ac8db736e791478d7894fa3ca5adcba599aed91d08db
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9976

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://dugedepap.ru/strik?utm_term=cuadernillo+de+actividades+para+cuarto+grado+pdf+2021 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405687/normal_6050f53f57e2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496585/normal_60054bc6bb9d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454162/normal_6003deeb5a774.pdfIn PDF document text
    • https://gafirupi.weebly.com/uploads/1/3/1/3/131384721/3478643.pdfIn PDF document text
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/145779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5ffc0bd29fdcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488810/normal_6002ebc6b9c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_606a7f83c1967.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/245051.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fc95261098e5.pdfIn PDF document text
    • https://xukokamil.weebly.com/uploads/1/3/4/3/134317204/ca71c7aeb2d.pdfIn PDF document text
    • https://berotejenikakoz.weebly.com/uploads/1/3/0/7/130775756/530619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0b01a4bf-9dd2-4167-8cc7-81af94e889d7/welaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4e1aca-5412-45f9-9c02-82b8adda192b/ritetufefiwagavixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2436f1b-808a-4495-a301-c14fec722995/vufupika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fccce70-8a00-449d-9ebc-226894758db7/cuadernillo_de_ingls_bsico_para_adultos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b380970-ee13-4c60-9348-0ff90aeaf06e/cloud_9_smoke_shop_kennesaw_ga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7cc1906-e0d2-4e42-a499-de38d2b8fdbd/migukuwufawabalofebaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9802b272-f7cc-4a97-b141-e539d5e1f418/graco_baby_modes_duo_double_stroller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b5b2d8d-9d61-450c-a111-f9cb4026326b/43297172683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca1709f-293f-4a10-9f47-b3bc7c97c276/john_deere_l110_drive_belt_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b659ef1-fbf8-4adf-a414-5c2fb3ffc1d7/gathering_storm_40k_novels.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
    • 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 6744 bytes
SHA-256: 8187145963fbf8e0b7977f93bb9cbfc296fb812f6e2b6f40a3c8d31ca5a797a4
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 5616 bytes
SHA-256: 8efb055bc50bc7d74c4d89abee5e5b2724c5a170a06ec4340540660aa7e428ce
font_02_sfnt_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 3608 bytes
SHA-256: 4b53760c5fa113e399cd0aa4a35b9b756208da1e06327224d81c5fdd2f5cb463
font_03_sfnt_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 11628 bytes
SHA-256: 64175867822890dbf705902f140b27db853878d53e47e43a2d08b3cd01f65afc
font_04_sfnt_off000133ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AC 16324 bytes
SHA-256: 323af5863e221420acd1bfe20aadb5bee40435064afe38ca97a385fdeafe47fa
font_05_sfnt_off00014959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14959 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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