Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96721e746ab9319…

MALICIOUS

PDF

76.1 KB Created: 2021-03-18 22:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 268d30a387b73676ddcfc5da3b6d0e59 SHA-1: b7ecc7d41e3b8a09a23e0200da4202a791518dd6 SHA-256: c96721e746ab93198763178fbd1e676737c7425fec2d139bb8fe63f67f84193f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=where+to+swap+sodastream+bottles+nz PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484375/normal_5ff456f9a8d5c.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/6jijajh/50810033220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474471/normal_5fe3067a0b2b8.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/JEhj4if/49082185101.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/traductor_ingles_espaol_para_descargar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_5fd62fb8b5494.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/97549464812.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/zenalusevuxuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468253/normal_604f15bfaa7e4.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/fK5T7FR/tetusomazomedidewijosawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5fc9a5ee2506e.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/1f7166a8-b1b1-4aef-85f6-702781ec79dd/ruruzapase.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_76881adea89e4058bf92fd08f3e555d9.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_3b5dd439f6bc455cbdac724ef4ef27bd.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_7f01bf458c3742cea2be2d8d8994c873.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bb0dae-2e22-47e8-ab47-5a2f1efc47b6/4320856751.pdfIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_6503e22377834b4f9bbae5f60b71bc30.pdf?index=trueIn PDF document text
    • http://bejanifezilo.atwebpages.com/present_simple_very_easy_exercises.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_8defc468d621429598e78dc47afdc222.pdf?index=trueIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_03e3af73069448f88820e872bd69de2f.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_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 5492 bytes
SHA-256: 232c3cd2cdfe3c13eba73641b9a95f5e1f8989b8929b198ed8e73136c0aa93be
font_01_sfnt_off0000fcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 11444 bytes
SHA-256: 77826601b8c738301ba6f2dccc5e32e3b4197a6ccf40b8d1dcbadd6eac33ed1b

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