Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e085693b96be33…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 10:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 361c4fff291d6c59bdd2810cac69c226 SHA-1: 1a1b37e24998d5da1f46ae2ea44e28b41e620a28 SHA-256: b5e085693b96be33ced12ca85f0ea96c0fe9e99ead1d5422ee9faf2ecf1854c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=microsoft+excel+full+course+pdf PDF link annotation
    • http://kripasec.com/userfiles/file/16838538676.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/logapo.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/84640347775.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/44898017101.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/30043673713.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442bbc81f60---fodoxuluterabozakeka.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/85902074422.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/88885becace47f210de4be61900ac17b/16405249760.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/36468362915.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/39455484311.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/wipitiloxekezixadolota.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/33212551102.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/witefolepogidunibomusen.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/17139631544.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/wibed.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/purejorav.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/lexunizosukukapujoworuji.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/66227776663.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-05/210905122508936122289glg0ih0nd.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210916194614034.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/rotalaxatikudalapavif.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/betot.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/47210090402.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_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 18516 bytes
SHA-256: 325161d88f04fc4d0f96d67f94436adc2f23feda8660542d464aed476d7c8598
font_01_sfnt_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 10544 bytes
SHA-256: ecabc7d1929291d2863e46919f5c81b12239f143e8c1cda0f4e6036485034461
font_02_sfnt_off000127a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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