Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a264adf4859420f…

MALICIOUS

PDF

101.2 KB Created: 2021-09-08 19:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 086c9eed86c66f79e5171a7ae084d7f7 SHA-1: f83a9728b502c90352eee9bb265e6a991ed480b7 SHA-256: 9a264adf4859420f0ff41d100c296dccfedaf5bfb408be50df2bcfc57fe84356
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using many distinct, potentially disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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 https://synerhu.ru/uplcv?utm_term=gareth+morgan+images+of+organization+pdf+download PDF link annotation
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/88928378203.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/fexesefeke.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/79761034823.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/47674677928.pdfIn PDF document text
    • http://reflita.lt/uploads/files/bamikixanofonal.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/vawuwudusoneroworoxarol.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/givogukelexudavaxomej.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/falowikupugewevunajo.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/notagumepujavenixekemo.pdfIn PDF document text
    • http://czyxchem.com/upload/files/suxufejenuxunesafeworowa.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/95369707573.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/pududowavizijow.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/650008319.pdfIn PDF document text
    • http://becucci.it/userfiles/files/66016947549.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/aab1e79810a5535df5b0ffa29b120a20/14923269008.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/tepumasibasavud.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/nodasudireko.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/38264659703.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/ximijesodolexobidal.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/1751558329.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/83355621801.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/tijigegavatinomefekotosav.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/jimejobinipufi.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138893741cb8---nijanof.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/sawonuwanokogowixisazawop.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/gunaxix.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/39911133396.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://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_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 11132 bytes
SHA-256: 29a78e53068caf6c52b0123d0421c292af761a76565194dd12ac8543ae20c113
font_01_sfnt_off00014337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14337 16632 bytes
SHA-256: 7b5ce21871c6f948d59ef53a19f6ab0c9180e7dea2aea1374ced6a4d3ee34639
font_02_sfnt_off00016e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1