Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0e21fbf8d6b5fc…

MALICIOUS

PDF

85.9 KB Created: 2021-09-12 23:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1d3f11459ab769729b284df22f9bcaf7 SHA-1: 310b3635ff2a1b5a683b5902f052bff2ab7bf820 SHA-256: 1b0e21fbf8d6b5fc71ab28af1e793033ae70bc5cbe6279498a73e106caf909a6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://newgrids.com/userfiles/file/fojigib.pdf In PDF document text
    • http://hydrem.ru/images/file/18885312357.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/kadubome.pdfIn PDF document text
    • https://ubranni.com/uploader/files/13457571941.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/88614989181.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/mufisakojujezovoxigimisob.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/sojeketilajetudami.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/koril.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/roxurefojefozixenavigepoj.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/terinesi.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/32972385499.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/divepagutesugozumeletofe.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/kuwawubi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161327345022ba---18587898218.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/3101435427.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/25b46c0b4ec837fc8b51179f536ba4ee/pilisobozirubunulivunesun.pdfIn PDF document text
    • http://soles2walk.com/data/file/59533395269.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/juxifodomi.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/41375286933.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/75742844680.pdfIn PDF document text
    • http://tai-group.com/upload/files/6091850069.pdfIn PDF document text
    • https://denimder.org/resimler/files/23997986884.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/75115865335.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/30317806348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=twilight+new+moon+read+onlinePDF 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_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 20044 bytes
SHA-256: 90db9e195b368a70d97355d12f495b9244d03cb2b5eb6152ee3af24338ead991
font_01_sfnt_off000119ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 10576 bytes
SHA-256: e1a7b27df1aefb7319b31708abfffa88818ede43928bfd4efa268ea3be31edd5
font_02_sfnt_off000131ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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