Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92d02ca28e34b7b…

MALICIOUS

PDF

73.8 KB Created: 2021-03-27 16:33:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a255c6d51495102d1142226aa6f5b74 SHA-1: 9d448290fc57f9ea3b639955c416bc67d6514af3 SHA-256: a92d02ca28e34b7b894b2d77a56a46265b55a230ebf7d2188b0fbd42f5228d40
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://resalured.ru/123?utm_term=android+auto+huawei+mate+20+lite', is directly embedded. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/123?utm_term=android+auto+huawei+mate+20+lite
    • https://zawibovime.weebly.com/uploads/1/3/2/6/132681883/nasiwexorepakab.pdf
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fd662e8cd268.pdf
    • https://cdn-cms.f-static.net/uploads/4446280/normal_60521763e8f3a.pdf
    • https://static.s123-cdn-static.com/uploads/4444114/normal_5ff3da16d606f.pdf
    • http://cardioactiveitalia.site/88695483253g1pvn.pdf
    • http://lezigovedavide.getenjoyment.net/beligexaposolopilado.pdf
    • https://cdn-cms.f-static.net/uploads/4371014/normal_6015a195d892f.pdf
    • http://kufomabid.mywebcommunity.org/paradise_lost_book.pdf
    • https://xukifunizagopo.weebly.com/uploads/1/3/4/0/134013279/da64755b996b88.pdf
    • http://nigoguno.scienceontheweb.net/briggs_and_stratton_500_series_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4411700/normal_5fd13ca070ed6.pdf
    • https://zexojoru.weebly.com/uploads/1/3/1/4/131409474/guruti_lunafov.pdf
    • http://runolive.com/websites_like_4chanofo8w.pdf
    • https://cdn-cms.f-static.net/uploads/4486045/normal_60339d19cd9dd.pdf
    • https://cdn-cms.f-static.net/uploads/4477649/normal_602758fd61fe2.pdf
    • http://goldenframecollision.com/android_theme_store_apk26d4o.pdf
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/9285430.pdf
    • http://kevekozulanilim.sportsontheweb.net/negative_interest_rates_japan.pdf
    • https://static.s123-cdn-static.com/uploads/4370089/normal_600984e5d6f6f.pdf
    • https://penosemoboz.weebly.com/uploads/1/3/2/3/132302809/misudig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_8827d9a942ac478494914be9f16e07a2.pdf?index=true
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_8612ed4f326c4c04b60d5ffe4c534fff.pdf?index=true
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_8955a2e6f3234b9e933c9c89c440c11a.pdf?index=true
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_3dd09ee50d004e058b97657bb47842ac.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_off0000e0ae.bin
e6ba9cd6dff467aff5fed290b6b46077c86bc5315e07115414f9a0096e049c14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 5240 bytes
font_01_sfnt_off0000f265.bin
61f40ff15c495745f7e698c02546da5a5d951baa101c5cdb2a8a3b87ef83673b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 11492 bytes

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