Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ec2a8902be3d8f…

MALICIOUS

PDF

81.6 KB Created: 2021-10-09 17:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: edbbc581740bc1c1ad831c1437640d84 SHA-1: 87b5e56f45896925ff64dd64b33aa98a97bd7070 SHA-256: 82ec2a8902be3d8f0f04a592bfaafb8745fe4ae1dc534d66068c120f08f59bf6
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on various domains, suggesting a link farm. The ML classifier strongly indicated maliciousness. The presence of JavaScript and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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://gotween.com/userfiles/file///51401453917.pdf In PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135b58a162d8---56458906873.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/wotaki.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/49208216793.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/koselilujuriwo.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/28281779385.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/powevufef.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/kowaloxozaz.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/72769599084.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/kozumo.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd51b2bc2d---37308946224.pdfIn PDF document text
    • http://anpharma.net/upload/files/97071557396.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/dijofu.pdfIn PDF document text
    • http://signauction.net/userfiles/file/natatamivono.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/74271951321.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/jolukorawo.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/mozufebefumuvaju.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/vadix.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/69733845758.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/zimimowoxivogodemopabeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=do+your+own+diligencePDF link annotation
    • https://easyown.ddproperty.com/datas/files/96589165128.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_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 10416 bytes
SHA-256: 51bfd2fae1972801b59130d7a3535e08f8023494d86a2d7bf45fa09f7ff5c447
font_01_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 19396 bytes
SHA-256: 02093673b06ef8163a3c751d5092f3068d1da9bad4383a6f7cfa31d5e425bbcb

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