Malicious PDF — malware analysis report

Static analysis result for SHA-256 207363b4f44692a2…

MALICIOUS

PDF

79.5 KB Created: 2021-10-10 03:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ab4f5da54a17fe868049f6fce6db1c57 SHA-1: c771da6308afd6a68f138024ba2b0efe11521ad9 SHA-256: 207363b4f44692a219bc6ee731e1dfc8affc5023f63e573aa11f51a9a25a5c1d
134 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or phishing attempt designed to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cesurmakina.com/userfiles/file/mosivatapozebenaroduvo.pdf In PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/vadibabalidamije.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161537e28e8665---noluwalapitawapitodig.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/tilufokusexajabube.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f509f5a097---lekanul.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/karuku.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/poduvetobemirusa.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/numoruw.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/56757394618.pdfIn PDF document text
    • http://kunbot.com/upload/files/benapeg.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/puzikikumusumuro.pdfIn PDF document text
    • http://vln.nl/files/file/xuvomesudolamow.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/pifijodo.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/pemibin.pdfIn PDF document text
    • http://195exim.com/datas/files/94176413355.pdfIn PDF document text
    • http://archive-2013.humandoc.pl/attachments/file/dokaxebedidejip.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/wofidubepakolovodegok.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/lotilurabu.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///topixabojodul.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/30231011530.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/letexererimunutawe.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/fafekapipexudixaretexilin.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/93707485939.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/wuvagekifoduwapofofuk.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/18247037075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+convert+pdf+to+excel+formatPDF 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_off0000d29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 17504 bytes
SHA-256: 275bb1765e7f89a026e8e016027f6ce01015fe6bd8909a6eccc74196f21bc9a2
font_02_sfnt_off000117a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A6 10768 bytes
SHA-256: 6b7b8d1f27165158770cbbc22e9ed149b96cfd76b02457795ed4c0f7460e47af