Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34b10c78d346f85…

MALICIOUS

PDF

75.8 KB Created: 2021-04-15 01:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0030bc992327d10fba00cedd6db8eca3 SHA-1: 4fafc28a3f6f10ef5e3e57d022a96d295720fc51 SHA-256: f34b10c78d346f859f77681ccbde1f3655d2c6bbaf98bbca859e5245a2d17b66
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or conduct phishing. The primary malicious URL identified is https://xezojetit.ru/strik, which is likely used to redirect users to a phishing site or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=goal+setting+worksheet+for+college+students+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383445/normal_5fd735f35516d.pdfIn PDF document text
    • https://sifudalumavobu.weebly.com/uploads/1/3/2/3/132302711/2341307.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/bufaresevi.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/differential_calculus_problems_with_answers.pdfIn PDF document text
    • https://zogoporev.weebly.com/uploads/1/3/1/3/131381602/rupovudoxexetagefibo.pdfIn PDF document text
    • http://wigemefigiw.mygamesonline.org/adobe_maker_not_working.pdfIn PDF document text
    • http://xikimubixod.22web.org/gaxuvedofopujalasoneg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_6024c72665540.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_b9cdcc83b866451d8c74f7a06b3ae589.pdf?index=trueIn PDF document text
    • http://sajutab.rf.gd/fizodatulabiwozu.pdfIn PDF document text
    • http://sijaxulo.rf.gd/autoimmune_polyglandular_syndromes.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_7144ee040fc24e458916818766321f0f.pdf?index=trueIn PDF document text
    • http://fibafewupo.epizy.com/74576190376.pdfIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_07e24699b65b4414b4677b1589ef5014.pdf?index=trueIn PDF document text
    • https://c207dc97-0cc9-441e-8caf-a702c1639d46.filesusr.com/ugd/36abe8_e374f824a62c4e9487a2cf858bf5ec8c.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_54a8d16e9c484de8a2d060d2d1f775a7.pdf?index=trueIn PDF document text
    • http://bepofitome.rf.gd/mujojafonekimagedasox.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/el_cerebro_humano_y_sus_partes_y_funciones.pdfIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_d1cc3fb8bdbd4b90ac7184501ad7843c.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_d1800379e29847ba97ae40cbaac35433.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_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 5604 bytes
SHA-256: ca9865a0b370a08a8b49ab3aaa2a5fe4484a2985275bad73948321c5580da1dc
font_01_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 10904 bytes
SHA-256: f2012389f5a5923f443438d5bf914b11d83e61f6a01a42a793df4652c555fe0d