Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b95717ce445118d…

MALICIOUS

PDF

69.9 KB Created: 2021-03-05 09:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 961696215ec1c0c4718fd5d665c19960 SHA-1: 71718b0cdef5e2e830f516e8c5fff56f4471c2a7 SHA-256: 9b95717ce445118d59a87c355b8e5bed4a3bb708009b2f1df4c78d8e454b2575
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to product names and technical specifications, suggesting a lure. The embedded URLs point to disposable domains and redirectors, indicating a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://crophysi.ru/strik?utm_term=samsung+vrt+plus+washer+delay+start In PDF document text
    • http://wejowadizabudex.mypressonline.com/57558285374.pdfIn PDF document text
    • http://eu-study.ru/vepozeronumukevilosijikamlc0mx.pdfIn PDF document text
    • http://papasewavixuk.22web.org/piriformis_muscle_tightness_test.pdfIn PDF document text
    • http://kasewokagirit.iblogger.org/madame_butterfly_giacomo_puccini_summary.pdfIn PDF document text
    • http://jajolamuseku.medianewsonline.com/fronius_ig_plus_user_manual.pdfIn PDF document text
    • http://tibetterrier.ru/41542400810c2tnw.pdfIn PDF document text
    • http://natbeach.space/go_kart_go_ultra_apk_uptodownosao3.pdfIn PDF document text
    • http://nncucuucuc.space/764807003138sgi6.pdfIn PDF document text
    • http://rodupokikoxozed.22web.org/39042184350.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_e2b99b4b47dc4995869864891e1b3a1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jawusawar/73264194325.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_e069fc4a7e334d648c73100f8f44d2a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/amazon_device_farm_manual_testing.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/blackmagic_pocket_6k_manual.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_4b1b6eba5c064b45a509633d79d31af4.pdf?index=trueIn PDF document text
    • https://e2d8889f-298f-4dfc-abc2-1738800e0fa0.filesusr.com/ugd/205ae4_af7e89c175f04c42acba90f06428df26.pdf?index=trueIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_d50679d421a442b683a814d32e42c18a.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_f75896ecfafb4fdeb3511e3f325720c1.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F0 5732 bytes
SHA-256: cca08c50f74a891830d7c79a412c2262fb8a8e0c125cb0f604838e7e179a16fb
font_01_sfnt_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 10364 bytes
SHA-256: e574fb58ccf25f61223a13a1e3f5512ffb621fe827475460dddbe1860f08e2bb

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