Malicious PDF — malware analysis report

Static analysis result for SHA-256 572d9332fcf84c76…

MALICIOUS

PDF

79.9 KB Created: 2021-04-16 11:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3fa7d7f6dd3fec55d3e0853915f61e76 SHA-1: 290ba5e780b7e512ecddaa9c2d63dfa369e0c498 SHA-256: 572d9332fcf84c76d35f356968858fb8cb3bb012dcf579039afdb20eee795cfe
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to PDF files hosted on file-sharing services, suggesting a link farm or SEO poisoning tactic. One of the embedded URIs, 'https://jottigo.ru/strik?utm_term=how+to+use+focusrite+scarlett+18i20', is presented as a guide for audio equipment, likely a lure to disguise a phishing or scam attempt. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=how+to+use+focusrite+scarlett+18i20 PDF link annotation
    • https://rifubagozoj.weebly.com/uploads/1/3/2/6/132695416/bigisufopiturorizado.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/7b7312242edb.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/jbMRgh1/fedozowode.pdfIn PDF document text
    • https://cdn.sqhk.co/xatuxazaz/iVgegdR/crib_sheet_meaning_law.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/qiaLyyS/benulomenufa.pdfIn PDF document text
    • https://xuzimelo.weebly.com/uploads/1/3/4/1/134132070/wuzolufavuw-liraxajomar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/what_is_the_divx_vod_registration_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf9f7f8-1c90-4098-80b5-9f5ce85847a4/pasta_boat_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/73280047396.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/ranerewilafabasawek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7bde207-9fe8-4565-b52e-f1aa180c1809/word_search_books_in_bulk.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/25232818978.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/niwevosimuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/511b13a7-fb21-49a5-9307-c6547a0f51b7/asp.net_mvc_5_attribute_routing_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/bolepil.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/camping_ria_formosa_cabanas_de_tavira_opinies.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/pure_data_patches.pdfIn 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_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 5448 bytes
SHA-256: d5aad5fad4ee2d1f5bc3742ecf13ca36941c4a5f49cb05cbe4fe059ca2cc3f79
font_01_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 11896 bytes
SHA-256: b0c9fb16579afefd90326285b73af221e752358b6ea50f7eb1f9841414761b98

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