Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef164b87aa3b9524…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 15:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c88eeaf8f67dad8f795e7e3a8dced744 SHA-1: 7fc5cd41a824c4eb0664683df11f863d6ee8eb94 SHA-256: ef164b87aa3b9524fdb2f6147a136cfe29736c5e5c300a7e5e347b4c22e925fe
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to PDF files hosted on suspicious domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, contains keywords related to downloading a PDF, aligning with the 'PDF_SEO_LINK_FARM' and 'SE_DOWNLOAD_BUTTON' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/award?keyword=current+affairs+2020+pdf+in+english+with+answers+download PDF link annotation
    • https://cdn.sqhk.co/pepigovagove/dSigrig/mibutovuwulasavebivam.pdfIn PDF document text
    • http://nakijeku.mygamesonline.org/356890467.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/25161624760.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/hgixdhh/merge_plane_click_idle_tycoon.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwowamuxodo/tcUvihL/holmes_air_purifier_hap600b_manual.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/alphabet_phontique_international_franais.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/66difii/18397599967.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/mixed_present_and_past_tenses_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/KyCYhij/zelemo.pdfIn PDF document text
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/tulino.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/que_es_el_contexto_social.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/4940165.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luborinizu/bafogoxawetigagum.pdfIn PDF document text
    • http://tibamupebunod.atwebpages.com/business_systems_analyst_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/shimano_alfine_8_maintenance_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/vuzaxavetigon.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/2009_ktm_990_adventure_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/96478099499.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/1582672224.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/storyboard_template_for_word.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/dogogal.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/capturing_marketing_insights.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/literatura_del_renacimiento_espaol_ppt.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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 5572 bytes
SHA-256: dc59c6c6aae8c9e1db438b9e2f41a5d1cd4bb3a8bbbe09b24d4392ff76d9df99
font_01_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 11508 bytes
SHA-256: d3ddf378a13c516d8192dfaee384e980c3e3b794d0ac2646abb2407cd1352061

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