Malicious PDF — malware analysis report

Static analysis result for SHA-256 582cf087bcbac8e9…

MALICIOUS

PDF

80.0 KB Created: 2021-04-08 03:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 142fb7516f065541627c66f8ef1eb808 SHA-1: ebc2c6acf7a8f7b32ac44eef066a76e2450f151a SHA-256: 582cf087bcbac8e9394d0976f3639a0510dc8a40797b8ccb7f1340d3b658074f
186 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, many of which are hosted on disposable domains or services commonly used for malicious redirection. The PDF's structure and embedded links suggest it is designed to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=math+worksheets+for+8th+grade+algebra+1 PDF link annotation
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/xejaji.pdfIn PDF document text
    • http://bigever.iblogger.org/bookmark_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/jaguwubax/05jUgh5/51273225879.pdfIn PDF document text
    • https://fanuterose.weebly.com/uploads/1/3/3/9/133999321/sojoraf_nijiwanup.pdfIn PDF document text
    • https://cdn.sqhk.co/gutejalajige/gmdvghb/codigo_procesal_penal_guatemala_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/zlibhj9/warframe_best_panzer_vulpaphyla_mutagen.pdfIn PDF document text
    • https://mogeletonedilo.weebly.com/uploads/1/3/1/4/131482944/medaxa-sokerixebiki-juvedu-lofumena.pdfIn PDF document text
    • https://nesefutuderixu.weebly.com/uploads/1/3/2/7/132740375/603333.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/geigoX7/steelseries_neon_rider_ebay.pdfIn PDF document text
    • https://zosetujisux.weebly.com/uploads/1/3/4/2/134266291/mupesumewofetogi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://robexekipojop.rf.gd/31904857096.pdfIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_a7f1123cb0274490b0b1b0ae041ce912.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_74be5700a8184b628be7da636dce7089.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf6d974-a6d8-4386-878f-3a5cf8a2304d/pentair_superflo_vst.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c20e4d0-01f5-476c-8db0-7c2ca60f5a1a/16130390293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f54b145-be76-4e3f-acce-f4616dc3b71a/7566072241.pdfIn PDF document text
    • https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_3c9793548bdb415a9df363594aadb188.pdf?index=trueIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_b6dd54835f55432d8f51847911256f3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c29593c-0081-49f8-801c-d8eb901e7863/6696625749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62be7f32-16f7-4f3f-93e6-96a19713ca46/jumifime.pdfIn PDF document text
    • http://dekagijudejiz.rf.gd/mipeg.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_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 5716 bytes
SHA-256: 334b811973e202591cbe44e16310ff6247bb0352e94f7e8e0cb85f9b985f58b9
font_01_sfnt_off00010e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E78 10480 bytes
SHA-256: 2287a881bb8b950f46763e900f3d3cc986eb6503be8dfadf25a86af6677f5f65