Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb98d837febbf8a…

MALICIOUS

PDF

109.2 KB Created: 2021-04-07 21:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 324ff6ebab4a5aa3f9fb0d05e301ca02 SHA-1: 0a5607305b466396312a2711933b9313e918da77 SHA-256: 3eb98d837febbf8addfe601bc74b13a83b7a7bca375fe020f72cf193c4665819
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on potentially untrusted hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely involving redirection to malicious sites.

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://jumiwimov.ru/123?utm_term=enteric+fever+ppt+free PDF link annotation
    • https://rizofuruw.weebly.com/uploads/1/3/0/8/130873790/3967107.pdfIn PDF document text
    • https://cdn.sqhk.co/zedozomi/egesVgj/ground_operations_agent.pdfIn PDF document text
    • http://galoomer.online/541241557029xkk0.pdfIn PDF document text
    • http://salebox.shop/zuwivabefafegimekivclzd.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/fgfIFF4/translate_a_webpage_into_spanish.pdfIn PDF document text
    • http://kewokuxumuzig.medianewsonline.com/xovibimewubovokalevepevob.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/cintiq_27qhd_manual.pdfIn PDF document text
    • http://sfr-espace.best/21668211283x0fem.pdfIn PDF document text
    • http://nicechange.space/roku_channel_codes_databasel6ql5.pdfIn PDF document text
    • https://wakebanimoxebej.weebly.com/uploads/1/3/1/3/131383753/6233630.pdfIn PDF document text
    • https://noxitituruvid.weebly.com/uploads/1/3/4/9/134904787/toxifoxebivamavezomo.pdfIn PDF document text
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/sezig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482002/normal_5fd0f40241010.pdfIn PDF document text
    • http://ejqy.com/ffxiii_2_trophy_guidexvoxz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_6013a05ba2425.pdfIn PDF document text
    • https://xipumizi.weebly.com/uploads/1/3/4/7/134746986/56e039.pdfIn PDF document text
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/mowadinaneb.pdfIn PDF document text
    • https://tewetakejuduz.weebly.com/uploads/1/3/2/7/132740850/pasobal_petixegezix_dunekef_peziki.pdfIn PDF document text
    • https://rulafowobunafo.weebly.com/uploads/1/3/5/3/135391395/verolovexi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fataragoreb.myartsonline.com/vexetakiwuwabuminubal.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_off00016821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16821 4604 bytes
SHA-256: 3e5aeebf9275c4c6a34ae043047e7a854b2cc6e0d00d4277f3118c73dc4bf300
font_01_sfnt_off000177f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177F1 15284 bytes
SHA-256: a1059445e7bd62ca28cab77d773bb5e9720768f289dfd85ddb6f0573529b8caa

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