Malicious PDF — malware analysis report

Static analysis result for SHA-256 549095e361784e6b…

MALICIOUS

PDF

72.8 KB Created: 2021-03-21 02:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0b8ef44d33183481c11242152e7fad2c SHA-1: 1d576f8b9f644799ee5a8c1ec8eb556a98a05799 SHA-256: 549095e361784e6b2f78ba8f8f1bedc057db109274fff0e5f22e583731329e71
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to a network of potentially malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://pelibifir.ru/award?keyword=weldability+of+aluminium+alloys+pdf PDF link annotation
    • https://nolobatunu.weebly.com/uploads/1/3/0/7/130740420/23e14e47b9d5f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484364/normal_5ff336fe3dd7f.pdfIn PDF document text
    • http://usacarins.com/solimisiruwifufexaretokarvvk7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495846/normal_600a6d1becc50.pdfIn PDF document text
    • https://pokasejazutiz.weebly.com/uploads/1/3/4/4/134447431/somexivon.pdfIn PDF document text
    • https://lumewogomor.weebly.com/uploads/1/3/4/3/134319436/78949fd118d.pdfIn PDF document text
    • https://popaxeras.weebly.com/uploads/1/3/0/8/130814769/radaxuj.pdfIn PDF document text
    • https://luwanolukurodo.weebly.com/uploads/1/3/5/3/135397368/2778360.pdfIn PDF document text
    • http://teren.fun/45445366661itsbr.pdfIn PDF document text
    • http://avto-trokot.xyz/40629351426du9jd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_5fd13fb57a9ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toxenekotu.rf.gd/sinuwujabonudum.pdfIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_0c8d0409d3c042a9891b7d4ed7a33959.pdf?index=trueIn PDF document text
    • http://wuwokumafinu.epizy.com/cuanto_tiempo_tarda_en_llegar_un_titulo_de_carro.pdfIn PDF document text
    • http://tivusanezidiv.rf.gd/26659937369.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_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 5344 bytes
SHA-256: 92e2508001225367f29adc77550624283bc4e978e5f0bc9b94cdba133cdb9914
font_01_sfnt_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 10508 bytes
SHA-256: bc7477db0cdba4829a7c6203ca6b9e82c6f9e8c7ec7d84d9df2c4d767d8eb9d4

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