Malicious PDF — malware analysis report

Static analysis result for SHA-256 3740ccc28f89ce08…

MALICIOUS

PDF

79.7 KB Created: 2021-03-18 08:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 753185e620c8b7dd57b9215c6aa0da18 SHA-1: ea134e4fbaf8b9d8c4ec328b1e72a6343d13e298 SHA-256: 3740ccc28f89ce08597cc0e285f3d854c5c4306e9f1f52ecddfbbf38b6e85259
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are used to redirect users to these external sites, potentially for credential harvesting or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • 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=pride+and+prejudice+1995+age+rating
    • http://meriline.store/vofekifedulokolukegimumefgib.pdf
    • https://sujabowumosof.weebly.com/uploads/1/3/1/3/131398195/wesepixu-memuboxa-zurunimaromemo-kijuki.pdf
    • https://cdn-cms.f-static.net/uploads/4402252/normal_602b6cc990db4.pdf
    • https://static.s123-cdn-static.com/uploads/4418746/normal_5fca3998c1a26.pdf
    • http://dorulezebum.sportsontheweb.net/where_is_the_drain_filter_on_lg_washer.pdf
    • http://myirn.icu/penny_stocks_to_watch_for_next_weekm3nn7.pdf
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5ff28542e02d7.pdf
    • https://babanude.weebly.com/uploads/1/3/4/0/134017813/fipetapuxowom-lefuranekivi-jateki.pdf
    • https://cdn-cms.f-static.net/uploads/4366033/normal_6048e2f9c23ff.pdf
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/2015608.pdf
    • https://lareduna.weebly.com/uploads/1/3/1/4/131453109/6101780.pdf
    • http://koponegigat.medianewsonline.com/what_is_criticism.pdf
    • http://ndfnasg.xyz/46324934125t6z0a.pdf
    • https://cdn-cms.f-static.net/uploads/4415769/normal_601ff19dcf28c.pdf
    • http://canlisohbetim.net/416804046894qtpe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_bb838f1153d540df83a2e2c4849c8133.pdf?index=true
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_49721cb5eb7c4cf1909b04dac826a4fe.pdf?index=true
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_73060dec8c074c19be57a0807902fb6c.pdf?index=true
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_9c4cf5f32ea04c1384fa8e12f77d2d2a.pdf?index=true
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_c848fe0baa254b84bc9c1205d7a7bda4.pdf?index=true
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_e447279256fa437e8968ea4d361e283d.pdf?index=true
    • https://d2497fa9-5496-4194-9764-f4b168485e88.filesusr.com/ugd/eed259_3fb965361e9a43498bc67a37ff0d31a2.pdf?index=true
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_9713fc1ef9644443bd76d2994033bff0.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f968.bin
18a8e1c31bfcc45e8aa88b9f9a2a02f6c0b04cc8af0ff19a5711e8e606c2b1bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 5440 bytes
font_01_sfnt_off00010c05.bin
3504785a6e41cac91b6cbc681d9558af6c4105604888f488724ce467599128d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 11056 bytes

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