Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1cb4eb05e2b365…

MALICIOUS

PDF

76.0 KB Created: 2021-03-15 12:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 21690182863af9989aebe36567a527c7 SHA-1: cb81e0270d133494a92af9026affdf522e0f0d18 SHA-256: 2b1cb4eb05e2b36553c03dfdb0ac28ddaa47d6b07d221271891109b983193434
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many pointing to disposable hosting, and one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or malware delivery. No scripts were extracted, but the primary attack pattern is the exploitation of user trust through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://yafferge.ru/wix?keyword=funny+tour+guide In PDF document text
    • https://tesafugefiwa.weebly.com/uploads/1/3/5/3/135318727/sepuneg-lifajujotexare-kexulemebi.pdfIn PDF document text
    • http://menbp.online/76996719867yw777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_6044aea12ad9b.pdfIn PDF document text
    • http://prazdnikprosto.ru/8709900529206233.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/45502494194jlwj5.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/kunuwevusefipugaza.pdfIn PDF document text
    • http://hookup157.fun/tojezanmt3g3.pdfIn PDF document text
    • https://vozokeku.weebly.com/uploads/1/3/1/8/131857213/52659b927b3.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/zhiyun_smooth_4_manual.pdfIn PDF document text
    • http://coolstudent.space/loxolivawaridojarad7ic9w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413966/normal_5fd0fa41cc055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_600eac9191514.pdfIn PDF document text
    • https://suzujiwome.weebly.com/uploads/1/3/0/7/130776055/6977418.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_af9d2490a1ff455c9cee2802af5779a1.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_0308e3f9206b4c35aebeacd8defe8f1b.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_f5dc9384b96941bcbcd246ba9253b018.pdf?index=trueIn PDF document text
    • http://vigavanoxe.onlinewebshop.net/luis_borges_el_aleph.pdfIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_09e1f7cc2eff4289ae7f27e0e07bd752.pdf?index=trueIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_54190ade77ee4614813569d88df5feab.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_c6e2a490b1354119b06948f501dd2021.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_ad775f28a4b543908b08d24009b960ee.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_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 4632 bytes
SHA-256: 25157374c3055b9aa5f6b9725a53825820e4c7a25f0140b53376f74b95689ed0
font_01_sfnt_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 10988 bytes
SHA-256: 9165e3cbe2a127b00a44e41537f347550860de6131f969fc47e3e29a2b45ecd1