Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f85d4143e98dd81…

MALICIOUS

PDF

102.2 KB Created: 2021-01-21 01:07:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9d3334f3d3f72681475b1058cc4beb22 SHA-1: 2e5b36bd02c61f7c29dc2af427e79fb58544393a SHA-256: 4f85d4143e98dd81a109f387bbe234df1354419f4dcd98ecb3ee101d626ab0c2
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to redirect users to potentially malicious sites. The embedded URLs point to domains associated with phishing and malware distribution.

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 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://jottigo.ru/123?utm_term=livro+a+privataria+tucana+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402533/normal_5fc937293e3a0.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/xadamuda_nudaganib.pdfIn PDF document text
    • https://dominisu.weebly.com/uploads/1/3/1/3/131379959/1592272.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378151/normal_5fec5a8d686fa.pdfIn PDF document text
    • http://nudazizefa.22web.org/guidelines_for_donating_blood_in_canada.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/pubutikexojag.pdfIn PDF document text
    • https://gulapekojikag.weebly.com/uploads/1/3/2/7/132741551/9998726.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404515/normal_600326632343f.pdfIn PDF document text
    • http://vukogosapejofa.iblogger.org/likigawab.pdfIn PDF document text
    • https://mugebixivezir.weebly.com/uploads/1/3/1/4/131484268/selekivut.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/mukut/valavemozalopako.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/66862208642.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/33465029330.pdfIn PDF document text
    • http://dulaxidej.epizy.com/76557966221.pdfIn PDF document text
    • http://zivikabazixo.epizy.com/crazepony_mini_camera_sq11_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/best_sport_live_tv_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/61943684447.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/gedabomigukiseva.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_off0001500e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500E 4940 bytes
SHA-256: 6f244539983885801abaf81dbf56ee25e26cb8919fd1c515f0dae06ac833d278
font_01_sfnt_off000160f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F8 13412 bytes
SHA-256: 3998e739c44e2438a49f3327811acea7dfc16056b77f0f507ecf6c984a826f62

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