Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3966011cbfc7b2…

MALICIOUS

PDF

71.1 KB Created: 2020-11-14 01:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 960cf7458917edfbe29cdc0d935a3d4a SHA-1: 1061959c55b9d20fdcfc61bd2b935f63687c9ad3 SHA-256: bb3966011cbfc7b257a2d3b97ded745469f30fedf676b44a5a377fa074054921
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of numerous external links, including one pointing to 'traffnew.ru/aws?utm_term=skype+3.+8+beta+old+version', suggests a phishing attempt or a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a social engineering lure.

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 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.
  • 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://traffnew.ru/aws?utm_term=skype+3.+8+beta+old+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5fa510b806456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5f8dfb5c469da.pdfIn PDF document text
    • https://puzemebakojufem.weebly.com/uploads/1/3/4/2/134234574/7033392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447107/normal_5fa1821f6c69f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_5f8c4d1216418.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/kerokopema_gekax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdaa52d-b79e-411b-b906-3d7aa405fe8d/21967157349.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/test_psicologico_del_arbol.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/amnesia_otome_game_psp_english.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/31938690467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f162b52-1edd-40d1-a04d-5a268b5aadc4/15385696046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf230f4-a0c8-4282-8282-170bb1a8077a/9624315800.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/madison_ct_white_pages_directory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3929781-2498-4f53-9d62-e65b1f59b587/vesazawipepegemoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dddfbd7-bb82-4bf1-8d77-044fc392aa7b/thousand_foot_krutch_move_mp3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39d6d16-bb51-41ab-a952-5585e2ce8c24/52480112093.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_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 5812 bytes
SHA-256: 1348ee4eb22bc873ea03dd1d522cd96fd337b45bec6df3bb6d26c97c9dfe28e1
font_01_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 9332 bytes
SHA-256: 8ecd465198cdd5f3103d3beb986a97357d0c22f251471b57b727a4a468709c90

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