Malicious PDF — malware analysis report

Static analysis result for SHA-256 a361186cda33ad0c…

MALICIOUS

PDF

77.7 KB Created: 2021-03-21 01:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6b58da1d0471e4dcf60a1e65736feec SHA-1: 78f8d1f856590128cfe9bcb1e7e3dcc79dccf047 SHA-256: a361186cda33ad0c8c198c931f7567dd3d6c12d94ca0ec26882096c478d4559a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary link pointing to a suspicious domain that appears to be part of a link farm. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The embedded content, though largely obfuscated, suggests an attempt to disguise the malicious intent by mimicking a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/award?keyword=fundamentals+of+quantum+chemistry+pdf
    • https://cdn-cms.f-static.net/uploads/4369491/normal_60375c23c57c8.pdf
    • https://cdn-cms.f-static.net/uploads/4377388/normal_604d027fe65dc.pdf
    • https://static.s123-cdn-static.com/uploads/4448113/normal_6008351bc08d0.pdf
    • http://zegererevez.medianewsonline.com/38590541325.pdf
    • https://cdn-cms.f-static.net/uploads/4416512/normal_603a4387707b5.pdf
    • https://static.s123-cdn-static.com/uploads/4495034/normal_60003b8b3b019.pdf
    • https://cdn-cms.f-static.net/uploads/4385216/normal_604468eb396a6.pdf
    • https://cdn-cms.f-static.net/uploads/4422133/normal_605219c70b86f.pdf
    • https://cdn-cms.f-static.net/uploads/4465403/normal_6035491b69f51.pdf
    • http://wutugidejavazu.scienceontheweb.net/pesumiletadasixokadiputab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_596d171e822f483eb620ab87d1afdfd5.pdf?index=true
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_6944bbbc077d4552b141fd6c380aaab7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e7662014-e7e9-4bae-99fc-dc8a05505071/why_isnt_my_kitchenaid_ice_maker_working.pdf
    • https://uploads.strikinglycdn.com/files/3c385c3e-9ba0-4925-a63b-424ebfdd5ac3/desudotofinevele.pdf
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_511e1c054c124d6ea25df49c757110cc.pdf?index=true
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_dd7357604a33409c8be2e336e3ec8e42.pdf?index=true
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_533b7eca19e44ff5b9968cd6c1852f2b.pdf?index=true
    • https://c055b2a1-966a-4c01-8d27-fc15ed7e73dc.filesusr.com/ugd/e3c460_53af4b22b37946f6b236434142c06d00.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c5c19306-be1e-4d6a-bf38-1edd45817c24/lederetuwobone.pdf
    • https://uploads.strikinglycdn.com/files/794f5a3b-a54f-4282-b272-9e137c02f45c/personajes_principales_de_el_libro_las_chicas_de_alambre.pdf
    • https://uploads.strikinglycdn.com/files/012ca80a-1256-42ec-a656-3c53d7eb1291/41901906624.pdf
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_ce38953c025841d883a3dbe76ca1dd48.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc6a.bin
a6b364639f55ec3cff851cdc0b30cf8bb688d1f63e0968c4252b56d7d4495d6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 5580 bytes
font_01_sfnt_off0000ef41.bin
faa6db036cbf958437dd93f301bca90e99e2184cf0f756c95d10f068ffb5a70c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 11060 bytes
font_02_sfnt_off000114a1.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 16060 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.