Malicious PDF — malware analysis report

Static analysis result for SHA-256 8342d1934e682bce…

MALICIOUS

PDF

98.7 KB Created: 2021-03-17 07:37:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44c280d70ce39ec139514d81d9c15946 SHA-1: 79290b8cb477c4178d360f8c11f5e2bc5fe0a48d SHA-256: 8342d1934e682bcebe49c28368891f3074af7268f9a36aac4a1e4456945101c1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated or use numeric slugs, indicating a link farm or SEO spamming operation. One of the primary links directs to a URL that mimics a search query, suggesting a phishing or malicious redirection attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=what+is+a+written+statement+of+purpose
    • http://oneitshop.info/9138220128qccmb.pdf
    • http://tertov.xyz/matemticas_financieras_1_jess_rodrguez_franco_gratisyakvu.pdf
    • http://cashbackk.site/pukemugerozatelawaraxizicsxkg.pdf
    • http://autolombardpro.ru/68921674682yzz07.pdf
    • http://resusawoka.iblogger.org/63395898507.pdf
    • http://spiritstudio.ru/burma_tv_version_9._04ce1v8.pdf
    • http://maddot.space/35958039301hbtv1.pdf
    • http://idealica-uficialeitalia.website/treatment_for_psoriasiform_dermatitiseuf7n.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wujapu/melenogudulirulikifob.pdf
    • https://s3.amazonaws.com/dudujopixejikug/8668691538.pdf
    • http://jupanev.epizy.com/88985817756.pdf
    • http://xawoforusur.epizy.com/antrenmanlarla_geometri_1_cozumleri.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/coplanar_waveguide_via_fence.pdf
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_c3eb4616af8a405da28af0ca8abf5163.pdf?index=true
    • https://s3.amazonaws.com/bededuxotulapil/wanna_one_spring_breeze_piano_sheet_music.pdf
    • https://s3.amazonaws.com/towakog/11484381348.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/clipart_apron_template.pdf
    • https://s3.amazonaws.com/vibuvomomuv/gokivoro.pdf
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_9c426aa100c041338a7631ce43f983e5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013800.bin
2bc35ff292c348512e4bc86d60708e0ab61c1dd7682a04217d9bfcd9330e5502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13800 5096 bytes
font_01_sfnt_off0001493c.bin
ebdf8bddd3782f885c4e16fbe8edf70342bf4adc4aa3e76e4ae238e47f591d9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1493C 11612 bytes
font_02_sfnt_off00016f98.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F98 4324 bytes

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