Malicious PDF — malware analysis report

Static analysis result for SHA-256 896f0244d3657af8…

MALICIOUS

PDF

76.8 KB Created: 2021-03-18 23:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 78ab52ea12294cca2a75b9e301d9b3cc SHA-1: a2bf3c3ef2b2b8d26945c61cfb4cf1c0021af4b5 SHA-256: 896f0244d3657af8c922e28d6794ca9ae22881c8327846af94242590d4088eba
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 domains, suggesting a link farm or SEO spam operation. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics indicate malicious intent, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to assessments and application names, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/award?keyword=4th+grade+math+pre+assessment+pdf PDF link annotation
    • http://daddytestit.xyz/american_education_joel_spring_18thmgcnt.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/Dgh5IyI/forest_background_hd_tumblr.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/fx5jb89/talking_birds_for_sale_in_houston_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/fjiYFoq/motogp_racing_18_mod_apk_revdl.pdfIn PDF document text
    • https://pexefosakojoma.weebly.com/uploads/1/3/1/4/131406105/5182360.pdfIn PDF document text
    • http://blu-ital.space/36831538083lpvnn.pdfIn PDF document text
    • http://sk-anker.ru/dibotodawosalustj5re.pdfIn PDF document text
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/8241834.pdfIn PDF document text
    • https://cdn.sqhk.co/miviluwulux/NahfWxW/wipewedojepimupek.pdfIn PDF document text
    • http://lomags.ru/nepudipee0v6l.pdfIn PDF document text
    • https://gozerivolese.weebly.com/uploads/1/3/4/2/134265833/dee549d5.pdfIn PDF document text
    • http://zzzmmmmejjj.space/how_long_does_it_take_to_become_an_ob_nursesje1p.pdfIn PDF document text
    • https://bowilidorufe.weebly.com/uploads/1/3/4/6/134603038/6083305.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_7d11c7acd23d4070b94242ad7c08f194.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tudawufed/student_registration_form_template_word_free.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_49e9912432184dcca665eb28f21ce25c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/20437512761.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_ee52a1248c6f4bafac27358d1a7a2f44.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 5416 bytes
SHA-256: 8ad1b92eeb2c2cbd6200659a3a023ae762fd4380618368ebee96f844d55f346d
font_01_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 10244 bytes
SHA-256: 13956cd16a8c0d872d6eec3ea13c93b1f21dffae0125d9a1dd35f8f26cdf783d

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