Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec29c47ea5c9086…

MALICIOUS

PDF

77.7 KB Created: 2021-04-12 20:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d19ddf791437b7376b54a2997cfb83c9 SHA-1: 2e411b07feb5c799fe4a786f8e05d6316329a7e3 SHA-256: eec29c47ea5c90869e31e5182efcc98d93440c8a054406760fd923b8f23a5cea
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF_SEO_LINK_FARM heuristic confirming the presence of a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the link farm suggests it is likely used to redirect users to malicious sites or download further payloads.

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://jacksth.ru/strik?utm_term=how+to+calibrate+mettler+toledo+scale PDF link annotation
    • https://cdn.sqhk.co/fusojafiza/2G6jeha/jisazorovujunefax.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/dVHgjhi/88819780288.pdfIn PDF document text
    • https://xabisipejerifo.weebly.com/uploads/1/3/4/6/134634854/forodebini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_60419b4f7e857.pdfIn PDF document text
    • https://bidopafogusiw.weebly.com/uploads/1/3/1/0/131070115/8959268.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/WwQjbdF/life_of_a_mercenary_choice_of_games_walkthrough.pdfIn PDF document text
    • https://kawawipebezuvo.weebly.com/uploads/1/3/1/4/131409621/laxufuxifanexif.pdfIn PDF document text
    • https://kewesolatuveg.weebly.com/uploads/1/3/1/4/131452958/19af240417043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5febf36fb73df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427094/normal_603ba43791109.pdfIn PDF document text
    • http://boxidodo.22web.org/94319466472.pdfIn PDF document text
    • https://lapidarofo.weebly.com/uploads/1/3/0/8/130874394/doworaxe.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
    • http://kovudefimure.rf.gd/rorejabo.pdfIn PDF document text
    • http://dumumuvuxu.epizy.com/topefozi.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_5baa76d021d149c18eb58b07fed74557.pdf?index=trueIn PDF document text
    • http://gogulet.rf.gd/80033431972.pdfIn PDF document text
    • http://sesosufavi.epizy.com/wisamuxixazasekajatabe.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_177ca6515e284071b91ab460dc61b408.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_7cc474238d164585a60aa1439467aeb7.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_c1c91a4253e74d3985d1b26edbff378d.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_6da1b638a2924303b0a9badadfa1c10c.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_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 4960 bytes
SHA-256: 99977fa041cdf119744c2802cd417e53d6d042311de3ae94995f259a2261b674
font_01_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 11116 bytes
SHA-256: 8ac589fcb06b16110eae2d6ace47e48ee383a95d35855a6725b1d513654e5e81
font_02_sfnt_off00011b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B37 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3