Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed28d31f07d4790…

MALICIOUS

PDF

94.7 KB Created: 2021-03-24 05:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53541ccfd971004254768df5b7f8ccfb SHA-1: 36b73878b675f0180105e558bac5300b648aa548 SHA-256: fed28d31f07d479065458b7b82f8ab278703b2481c5febf3fac05bedb8ac4b24
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded URLs likely serving as lures or redirects to malicious content. Although no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://zajinet.ru/strik?utm_term=how+to+write+movie+review+with+example
    • https://dupukaradox.weebly.com/uploads/1/3/6/0/136015529/raponerixomowe.pdf
    • http://sodowetan.mywebcommunity.org/paladin_5e_spells_divine_smite.pdf
    • http://bikejesoxatelo.mygamesonline.org/the_complete_guide_to_asperger_s_syndrome_download.pdf
    • https://fevobubutexub.weebly.com/uploads/1/3/4/4/134481878/xewujeko_mobekuvopukevu_falizogito_sifapuzafo.pdf
    • https://fuxogadukuka.weebly.com/uploads/1/3/4/6/134688721/gatomovabaruwatoza.pdf
    • https://wegejazibeb.weebly.com/uploads/1/3/5/3/135305894/ceb9a4751275a.pdf
    • https://lodarexuxune.weebly.com/uploads/1/3/4/3/134352809/9f1611f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_8885733f4b4648aa82596a8f82875e64.pdf?index=true
    • https://s3.amazonaws.com/gulapore/38204703796.pdf
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_f594d42593aa4b969b53849c2b76a35d.pdf?index=true
    • https://s3.amazonaws.com/tokafanawa/wobibojuvoxogekezikom.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/10774265071.pdf
    • https://uploads.strikinglycdn.com/files/ce1ad1e8-378f-4192-82df-073ac065fa6a/formato_de_arrendamiento_sunat.pdf
    • https://uploads.strikinglycdn.com/files/8542eed2-7e87-458d-b8bc-e10ac7694099/zinulokesezugif.pdf
    • https://uploads.strikinglycdn.com/files/e93aa6ad-9208-4a7b-b724-1a7c33805ed9/66421757697.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_9c0351cd49aa4bae9c6d2c5e89343582.pdf?index=true
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_96578b58988b4977b828a101b2a17e37.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3b6d0da0-bd69-4e9c-9da8-d3e5e67ce9f0/mystery_method_audiobook.pdf
    • https://4ab51db4-2ab9-4ce7-8cf9-a7235cd4f8a6.filesusr.com/ugd/c6359c_af51e4a89234447393f8b5849071e32a.pdf?index=true
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_fa2c366798264ae98118947325c6422e.pdf?index=true
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_2f7d70171e8f4cee9bccbd84037fe9df.pdf?index=true
    • https://s3.amazonaws.com/napejaxosinages/11787767292.pdf
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_35c9f1a84b4a40c18c98205b92386229.pdf?index=true
    • http://tobikinos.onlinewebshop.net/91403870590.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126f2.bin
c632489e737017f407c7a89142f303b2b211eac57a21d7a18c227f22750e4a2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x126F2 4744 bytes
font_01_sfnt_off0001371b.bin
449a58fdfdf0ebb85c7aba2bc61feec9bc1a9e51b5dd0b782d75470e84399e56
pdf-font-stream PDF embedded font (sfnt) at offset 0x1371B 11124 bytes
font_02_sfnt_off00015d00.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D00 4324 bytes