Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb5eed25a93f8b2…

MALICIOUS

PDF

88.6 KB Created: 2021-03-30 05:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1e6b833be8abb75ce991238166c82238 SHA-1: 862561e4011150060c85f74aec565cff941ae5e8 SHA-256: fcb5eed25a93f8b2927bc39117dcd8983f75f135cff04e1c33fdaf942d137d3e
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 0.9992

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://fokemale.ru/strik?utm_term=html+and+css+tutorial+2+case+1 PDF link annotation
    • http://rosutob.getenjoyment.net/araby_james_joyce_sparknotes.pdfIn PDF document text
    • http://rixuliketasaban.mywebcommunity.org/zubuzuz.pdfIn PDF document text
    • http://lefuduzitenazig.22web.org/codigo_ascii_signo_de_interrogacion_abierto.pdfIn PDF document text
    • https://vuguzunorofina.weebly.com/uploads/1/3/4/3/134322364/fujanegesimed-ziverugadojoto.pdfIn PDF document text
    • http://bagawixaj.mywebcommunity.org/4067896950.pdfIn PDF document text
    • http://gusebozaromurel.mypressonline.com/budgeting_and_budgetary_process.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/45234940584.pdfIn PDF document text
    • http://zofazosedam.iblogger.org/57449542474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_6035cb9accf18.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/how_to_connect_hp_deskjet_3050_j610_series_wireless.pdfIn PDF document text
    • https://kewalagaxed.weebly.com/uploads/1/3/4/8/134864879/64f38591ec35c.pdfIn PDF document text
    • https://memapuzubabevu.weebly.com/uploads/1/3/0/8/130813849/2018377.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369783/normal_60012ad5522a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459176/normal_602625cf6e018.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/49213072441.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kimovene.epizy.com/52791471104.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_939a7eb268e94b7890082f38380ad8f9.pdf?index=trueIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_d10c70c969e84ac3a0fa7b860f6b39ea.pdf?index=trueIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_ecf69950ee68427e87dd9d9b607347d8.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_9a2e664bded44c2d98ffebc52888bb47.pdf?index=trueIn PDF document text
    • http://kigagizotag.onlinewebshop.net/81555803010.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_6f8bbacd858449f3a16a6b283d06a1f1.pdf?index=trueIn PDF document text
    • http://jopubijako.atwebpages.com/lenaxusodifasubumigukop.pdfIn PDF document text
    • http://xolisijepe.rf.gd/risaxu.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_off000119f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F2 5228 bytes
SHA-256: e597ff7a6bae4c6ac5e0c78a763c06850d3e51ab07252f731a27b3d0c25e4bac
font_01_sfnt_off00012ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA3 12156 bytes
SHA-256: 579c6f1c3f344d3e2f6f0da759cddf11f1f6016f6f4f86a2ca3b7d4b8c0e8dc5