Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d68e1fb34663ae…

MALICIOUS

PDF

78.2 KB Created: 2021-04-09 18:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: dd7878ca0f5816405682a1d93d38cca1 SHA-1: de52ffabfc2a2a487ff81fd4c21ad36fef1e75c9 SHA-256: 21d68e1fb34663aedf062fa9c8ec099e06bbc14bdfbbe2c771cc28aea66b7b32
166 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, many pointing to disposable domains, and a heuristic identified it as a link farm designed to obscure the final destination. The presence of a 'password-protected archive lure' heuristic suggests the document's purpose is to trick the user into downloading an encrypted payload, likely after clicking one of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gimoguvi.ru/strik?utm_term=padi+open+water+diver+dvd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5fd69d45e192f.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kisunika/hhjzjj2/churrascaria_favo_de_mel_goiania_preco.pdfIn PDF document text
    • https://cdn.sqhk.co/noxobabidof/RUh9q7h/impulse_response_matlab_system_identification.pdfIn PDF document text
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/520963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_6044ceedde738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_601f70239fb65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_606297e937138.pdfIn PDF document text
    • https://xerupirep.weebly.com/uploads/1/3/1/4/131408033/jovadelejotik-rumosed-nejevumivo.pdfIn PDF document text
    • https://cdn.sqhk.co/luzigagoguna/ajgHiev/90229546481.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/gjwzr0O/foviwopilogifap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379842/normal_5ff54e5d8fc11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386595/normal_6035890e4aa33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367960/normal_5ff86f6c9066f.pdfIn PDF document text
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/efa96b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453889/normal_6025a9a19284d.pdfIn PDF document text
    • https://xasigusuvenazuj.weebly.com/uploads/1/3/0/7/130739755/kuviwubin-wunaxajexakuw-fajurigog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_6e3c42c7c743460b9786c30363ab0187.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/65547322533.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_c75560f0dcdb4d38b5e82bbcde74b1bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/xixeluvebamopufugozoso.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/how_to_start_toro_power_clear_721.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_fba3af3f63884c0b99cfaf78cfd45a59.pdf?index=trueIn PDF document text
    • https://d64d5b41-a66a-4b78-b87f-0feaf8e9cf76.filesusr.com/ugd/cf1aed_ba51d2d414e346feb88a80fe3c7c7160.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 4684 bytes
SHA-256: dd8782f80e6f1572d23c161e07128d0316c9e673f638ea97874b56f4bf75816f
font_01_sfnt_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 10768 bytes
SHA-256: 1830d4e0cf369ce85392a3838b98550b5614c59c41a754f9a4d626cd1b98db22
font_02_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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