Malicious PDF — malware analysis report

Static analysis result for SHA-256 a959027023b6e7a8…

MALICIOUS

PDF

76.7 KB Created: 2021-10-17 13:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 55b12a4e66484004349e0f85416fb7eb SHA-1: 4e89e230330a26795dfde1959945e605614ebdcd SHA-256: a959027023b6e7a82aa1bf132300c993ebb0752b483ca8d95f26bafd7bd84f2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 5

  • 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 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 http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/botezatadopunaxutebi.pdf In PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/23474010075.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/57963090029.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/nipolifijidifamizenav.pdfIn PDF document text
    • https://mcorretajes.cl/upload/file/54078865096.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/50492377651.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/37913198767.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/rabizutoladitapuzo.pdfIn PDF document text
    • https://upaspor.com/resimler/files/73923843045.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/rurumij.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/90619500305.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/36a09a6ab035de9d632438096b385e97/gosifiridokuwutaluzam.pdfIn PDF document text
    • https://st-stephens-church.com/upload/File/63315234553.pdfIn PDF document text
    • http://salwex.hu/file/golapawezajetaxekul.pdfIn PDF document text
    • http://cuanhavesinh.com/userfiles/file/sujefixal.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/ziladatemawubolari.pdfIn PDF document text
    • http://fgosvo.ru/files/files/47108618105.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/lozebatuwodiraguvala.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/najok.pdfIn PDF document text
    • http://vce34.ru/attachments/file/47925526971.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/bexuzobipetodel.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/29675763955.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/86146119382.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/97687386821.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/99431006115.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/falelidug.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/vafunirotekigukedonovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TSvcnjQ06Jg/uplcv?utm_term=mcq+on+forecasting+with+answersPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70E 17352 bytes
SHA-256: 593697bb8aad280ad909f45a2abbf9627fff5d7a032d1ef86667169611d0e273
font_01_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 10792 bytes
SHA-256: 47577b1ed6590663d285b60b3a07fd8a4d7ffdb07f411cb9e4047b4f6ea5b2f0