Malicious PDF — malware analysis report

Static analysis result for SHA-256 4258e5f1c46ff984…

MALICIOUS

PDF

76.9 KB Created: 2021-03-19 05:00:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0e05bb747104f893cccdf3de5ade2df SHA-1: 2c53596aee93452f474ba8a3068afc7adf076c4b SHA-256: 4258e5f1c46ff9846fb06ae5e8a962250f63f1c4a402e22bf9d9a099edd4b4f0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a PDF link farm, with numerous external URLs, suggests a phishing or SEO manipulation attempt. While no scripts were extracted, the document's structure and the high number of external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=ocean+biome+animals
    • https://cdn-cms.f-static.net/uploads/4488322/normal_60245366f2f09.pdf
    • https://cdn-cms.f-static.net/uploads/4493545/normal_604e427a18124.pdf
    • https://cdn.sqhk.co/bopibege/NTwij2l/tafaladuwuz.pdf
    • http://lnstagramcopyrightcenter.com/non_ssa_1099_form_californialn7t5.pdf
    • http://mifvideo.space/backstage_pass_templatelpykf.pdf
    • https://cdn.sqhk.co/sawibevas/hhg0ZZB/35927802321.pdf
    • https://cdn-cms.f-static.net/uploads/4464323/normal_6040ac7c15051.pdf
    • https://cdn-cms.f-static.net/uploads/4377371/normal_60206749591a3.pdf
    • https://cdn-cms.f-static.net/uploads/4461201/normal_604e693fc624d.pdf
    • http://salearea.pro/toteruxef6bdd.pdf
    • https://cdn.sqhk.co/businaxidare/FXifjga/ferun.pdf
    • https://cdn-cms.f-static.net/uploads/4447097/normal_6020893ec2297.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_5ed183bf08444d5f9ded6dcae11b2b7c.pdf?index=true
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_f94d3e80aa514efd9999be17b831e548.pdf?index=true
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_c9fab3a0a19a4752a5a575a5a4370dee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c91b1502-0225-4030-8cfb-92b64d1c2db1/posidesit.pdf
    • https://uploads.strikinglycdn.com/files/8657d08b-ff59-478c-945d-cf99c1784812/58864896683.pdf
    • https://uploads.strikinglycdn.com/files/6e04ff87-b1e2-400a-b60d-74a8897d7115/mirro_pressure_cooker_gasket_m-0534-11.pdf
    • https://uploads.strikinglycdn.com/files/e8b5cc2b-5710-4de6-894d-30646e021e4f/guwadegadebagilanevijez.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e1.bin
31e54d9e5d7a3f682ae3aa0fa7d3d71dbc41d273f7e8f95c9b10efbafea37f92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 5016 bytes
font_01_sfnt_off000101dd.bin
d97d55e22be615a427ab159352597eadc9a8063c23bc54665c382c1c0468eb2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 10840 bytes

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