Malicious PDF — malware analysis report

Static analysis result for SHA-256 340a6bbd8fff84ef…

MALICIOUS

PDF

76.9 KB Created: 2021-04-06 23:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8a33fa31d6e123f21513532a3a0df505 SHA-1: 54f6347ec4084ec3ff5c182eafc78c947ccb0d6f SHA-256: 340a6bbd8fff84efec865cdc485b89c77291bf2ec6aa697c88a54a4607c73040
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/strik?utm_term=nitecore+d2+instructions PDF link annotation
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/9e9384.pdfIn PDF document text
    • https://jefaganogebe.weebly.com/uploads/1/3/1/4/131437435/zevevikuma.pdfIn PDF document text
    • https://wamukefak.weebly.com/uploads/1/3/5/3/135324497/47db73734bd9c2.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/ejhhfuA/stick_cricket_live_wiki.pdfIn PDF document text
    • http://zawuruliwisevo.iblogger.org/rirawipipapuwixixuviv.pdfIn PDF document text
    • https://cdn.sqhk.co/barevirus/dhgjKdi/ac_odyssey_atlantis_dlc_review_ign.pdfIn PDF document text
    • https://vefamomapebimid.weebly.com/uploads/1/3/1/4/131406391/313368.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_c6f7a29f24e749a4b6ab105ec30b5f6f.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_2abad2aee0834e69bbd6f357aed75166.pdf?index=trueIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_f5fd97167d8c43c0a194a78f3f00bb95.pdf?index=trueIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_059288c5482d4d309eb6f3f3a0fe8059.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_ee9da082a91f4c2ba45f1dbf44ad4977.pdf?index=trueIn PDF document text
    • https://b416d2a3-330e-4518-8f5e-c931256b4cd1.filesusr.com/ugd/5168b2_c92d1c38c8e44843a5c9ae77bb162bf2.pdf?index=trueIn PDF document text
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_1332d4af01bd4e9da36d7159da750c84.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_097bd7515c974e20aafca953030e8da6.pdf?index=trueIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_85e3bfa4539c4b8584fe0bff07f78c00.pdf?index=trueIn PDF document text
    • http://zokekoja.rf.gd/fusionner_des_fichiers_en_ligne_de_commande.pdfIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_2594022fd84a49ca8dd5a5287d7a11c9.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_d68baf0b85494ce79823d1ecea980a85.pdf?index=trueIn PDF document text
    • http://tuguwobafadurot.rf.gd/regave.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_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 4792 bytes
SHA-256: ec0fd83b5292cc03d69f22b898ef29f7ebc7705dffc587c6886ca424a6d860b4
font_01_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 10796 bytes
SHA-256: c4e196207887894fb7c3b17b6c541f5d4a870a51ba7c2ab83b10cb0c1b62858f