Malicious PDF — malware analysis report

Static analysis result for SHA-256 084b4f607d2a3e83…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 21:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7fbbb9f2b9212d6515e7c588a9990b8 SHA-1: 605055761d254f8df8bc8da48838011fae7e6803 SHA-256: 084b4f607d2a3e83dc8acef018aadc9a8953a0066b72bed32babed2e2894eb5a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to external domains, many of which are PDFs themselves, suggesting a redirection chain. The PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate a deliberate attempt to host many links on disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the overall structure points to a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=bluefire+reader+android+download PDF link annotation
    • https://ladachess.ru/userfiles/file/29201127286.pdfIn PDF document text
    • http://arsvet.ru/img/upload/32527896953.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/71621958256.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/zoninabem.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/rifowidaza.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/66595064020.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090613502273499.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/23667707903.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/xudojaverenedimerasekufud.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/divutumofefeteveguzitegu.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/bonaxulexawoluborusagi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613544dae9578---34196001663.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/rimafomo.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/vopewuvunefivefab.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a483e0e098---vategedijurobasixuj.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/pojekibununumevonotax.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/febir.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394f280634c---gokalabarumijaf.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/wejonuvarigirikezazixat.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109060907015401.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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 10320 bytes
SHA-256: 56498e0e31c623a4f50dc022395616033f202367c4e58b2a19458d19260128e7
font_01_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 17584 bytes
SHA-256: 77d70f88be6d01ecca05cfd066ac87e14352c99983da78b2fcd14625db5f7590

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