Malicious PDF — malware analysis report

Static analysis result for SHA-256 8595c73a306dc5a8…

MALICIOUS

PDF

71.9 KB Created: 2021-10-09 16:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 532fee805bd076b45eeef62d153df4fd SHA-1: 6e57f1b3e707684b1e72b1500fb68ac032c05ce8 SHA-256: 8595c73a306dc5a8270c1f456ddb65248b09fc745b9943650d217c5ba287fcca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF structure and embedded content indicate it's designed to lead users to potentially harmful external sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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 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://toyteepee.com/uploadfiles/file/210929102347696082fnr7vw.pdf In PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210912040416.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/51786769692.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/67920196766.pdfIn PDF document text
    • http://ruihuitax.com/files/file/52878105092.pdfIn PDF document text
    • http://change4best.ru/upload/file/72485984533.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/2158898526.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/tonufexeluxepagel.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/negubixokilimuwawok.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/76915994527.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/3530477231.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/zixopazipek.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/gasereb.pdfIn PDF document text
    • http://www.farimar.pt/imgs/uploads/xijubujetesaras.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/miguzelaf.pdfIn PDF document text
    • http://screen.by/images/file/13795596434.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/45317109089.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/sesezazugepamasumumil.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/pemuxe.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/64091243100.pdfIn PDF document text
    • https://iword.de/userfiles/file/bavijepolidi.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/14390040284.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/tikilefonuninef.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/rifukowaneko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fear+of+holes+trypophobiaPDF 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_off0000b9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C4 10584 bytes
SHA-256: 2016b7a3c4e8980b4ae666769563e17a218e884d8fb94080841490b81912f3f0
font_01_sfnt_off0000d1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 15376 bytes
SHA-256: d0cc2283dcf1be741d4f56dd7a74874a0239a233406d60faddcd1a0ced996d99
font_02_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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