Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9789379d8eabac…

MALICIOUS

PDF

79.1 KB Created: 2021-03-27 12:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 18934bd178e238143d05097dba552b43 SHA-1: 30e8eb7fcd6310706626127ed5c2923862b41278 SHA-256: be9789379d8eabac143c1642bf156186eed8637ec919373700bd41e3575dea89
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'Problemas de trigonometria resueltos 4o eso pdf', aiming to trick users into clicking malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=problemas+de+trigonometria+resueltos+4o+eso+pdf In PDF document text
    • http://philonio.online/likapuloxodipumiz1el.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_600ed419820a5.pdfIn PDF document text
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/1574042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_60110c3c45136.pdfIn PDF document text
    • http://stavki-na-sport.site/the_witcher_last_wish_audiobook_freezxvpf.pdfIn PDF document text
    • http://hq-cleartv.info/mawutedopajebesagidp0eme.pdfIn PDF document text
    • http://pressit.space/great_sausage_recipes_and_meat_curingje1pk.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/gubowitomibugajemedena112ut.pdfIn PDF document text
    • https://wemuwenaxi.weebly.com/uploads/1/3/5/2/135298044/kurotifozogolanow.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://takipleskazan.org/accg315_group_reportca33y.pdfIn PDF document text
    • http://sesalon.xyz/42385355019ux3lh.pdfIn PDF document text
    • http://medyayazilimtr.com/face_mask_required_sign_printable_spanishtlmuf.pdfIn PDF document text
    • http://idealica-ufficiale.site/what_is_the_end_behavior_of_the_polynomial_function_as_then_as_then_as_then_as_thenbxsq1.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://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_fc3856b44ee943de9b9bef9150c9b99e.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_43be4d161e594fee80ac2b4d9f8a17e7.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_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 5472 bytes
SHA-256: c4f30d2f213a4eade57a864876e7b597ba6ac830633af7c5f536fad9558454e9
font_01_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 12032 bytes
SHA-256: 79345b75cdcbfe35c4b253b04f804935d8d8e8787beae2d16a5b1a14def350cf
font_02_sfnt_off000120f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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