Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82af569322060bc…

MALICIOUS

PDF

71.5 KB Created: 2021-09-20 04:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc720fcd1b122d570bed0b9d8b394a18 SHA-1: 723d7f8291a95683e7a43a354c7181178647f8d4 SHA-256: c82af569322060bc1026e2d9763edfed143cf3e5bbe737aa2020e1f0b3ea1642
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many URLs points to an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=inshot+latest+version+pro PDF link annotation
    • https://oncallanatomist.com/ckfinder/userfiles/files/75074369268.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109161857511863.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/esij1b9uhr3268aaggekdhb6p7/zirirumevugevul.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/260704675.pdfIn PDF document text
    • https://megashina24.ru/files/files/kunojikesomelipimegatalo.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/remowidixerodujapixobu.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/xogapexezoliwad.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/fojobakivijagosun.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/jededijasaxunopalirubi.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58233531846.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/31586624446.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/77036466666.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/63529518192.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/tepedusexepir.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/48392766904.pdfIn PDF document text
    • http://agmapure.com/upload/files/wugabu.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/74635523509.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/tesaminanabuxowi.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/25059980437.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/jufixerutilovepopobepaf.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/665cc0e44252481e66efeb1b5657c285/wowoxaminuzegux.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/bimiruzata.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/41230230597.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/35103729893.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_off0000b75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6C 16420 bytes
SHA-256: e1795af5480c71d4430d8b68221a643ab238ff4a60c081df87dad2561ca40f3c
font_02_sfnt_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 10364 bytes
SHA-256: b7c0edd3d5ced9b14b8775ce9874b3582e60428ecac15d90833c60b4f9b7e817