Malicious PDF — malware analysis report

Static analysis result for SHA-256 832281dd5e25a155…

MALICIOUS

PDF

78.3 KB Created: 2021-04-05 11:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55020a97faf1fc9243a13a517a8a6254 SHA-1: 55a587a56d81c9586c1624f685fc727b3094a4cd SHA-256: 832281dd5e25a15566748a3bcc67c1bfa6d98ff3ff633b91771487f135d9bb19
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=english+books+for+learning+english+pdf
    • https://pewatusikowago.weebly.com/uploads/1/3/2/6/132683224/xudukejer.pdf
    • http://jonoxosu.iblogger.org/podejewunigedefalaxi.pdf
    • https://zatiwakap.weebly.com/uploads/1/3/1/8/131871625/mosutev.pdf
    • https://cdn.sqhk.co/kobewudojuvo/cjgjfgh/selik.pdf
    • https://dozasasakebo.weebly.com/uploads/1/3/1/1/131164234/xatunabudomuwoduviku.pdf
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/7455753.pdf
    • https://cdn.sqhk.co/libigekukaru/D44jihb/debt_payoff_calculator_excel_template.pdf
    • https://cdn.sqhk.co/tavaxiwugo/dEy3hHK/neguzugofevunawokivi.pdf
    • https://ronojunigamedez.weebly.com/uploads/1/3/5/2/135297775/mabesifujuj.pdf
    • http://velixone.66ghz.com/expressing_yourself_billy_elliot_sheet_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/056580d1-88ed-4102-af19-5aa8d98654cf/pegutepajesupetamonurelis.pdf
    • https://uploads.strikinglycdn.com/files/7306d066-eabb-45e5-9442-67e2d3723af4/bank_compliance_officer_qualifications.pdf
    • https://uploads.strikinglycdn.com/files/7dffad60-9f6b-4f5a-adc4-eebd7f93fc29/15326953400.pdf
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_3036b81e3bd24203a82ff10742eab43b.pdf?index=true
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_dea4661f25f94a68b4b6b2384d16113b.pdf?index=true
    • http://kedukukixef.epizy.com/92724980619.pdf
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_1265d6aaa0804d7e8e975b4882c91f21.pdf?index=true
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_ae9fe918885c4ec492e240e42016a8a6.pdf?index=true
    • http://davojuke.epizy.com/faa_airman_s_information_manual.pdf
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_b01488a170a0435b949725230d81ca27.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_off0000e589.bin
887bc68eabdacc73be814a4636db982b53003459fba7e5a39acc438039681e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 5464 bytes
font_01_sfnt_off0000f80f.bin
be2e3595ff4efc4ae89d0d533636aeb5852c9803a6a4740b0821b40a29a9485d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 3484 bytes
font_02_sfnt_off0001055e.bin
20d1906240644d94387663a08bdd3a93c8b4390c647ec164357519bab8a5ab05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 10672 bytes

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