Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b9aa9061cff296…

MALICIOUS

PDF

76.2 KB Created: 2021-09-20 04:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a295014b88d329bfeb520ebd44951040 SHA-1: eac86111995c1a3f9a00d70e18609ff6b875a8bd SHA-256: 61b9aa9061cff2966a960b759b0ea5fcb0b658e7b4b0551faff23521e6051864
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many of which appear to be part of a link farm, suggests a phishing or malware distribution scheme. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://irlanc.ru/uplcv?utm_term=x+men+apocalypse+english+subtitles PDF link annotation
    • http://csc0451.com/userfiles/file/20210905033606_etr21j.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/xifetujawi.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/88714468773.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/19686396863.pdfIn PDF document text
    • https://teamcode.net/upload/files/nebirusafozojivafi.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/40898941939.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/kebedepef.pdfIn PDF document text
    • https://grouptm2.com/contents/files/bibelem.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/vomorisisexalagez.pdfIn PDF document text
    • https://avela.md/userfiles/file/23682677954.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/vabup.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad739e849---danawejonuvudirasem.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/sifiv.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/sisix.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/mifipuzapebotawirenumaj.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/46453417241.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58922246829.pdfIn PDF document text
    • http://fnathservices.com/upload/file/dowokavaxus.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/xadimuxanejoxu.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/76010767955.pdfIn PDF document text
    • https://t2sc.me/userfiles/54333340399.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/56639468124.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/4023280526.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/zemexanukamulomex.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161343b8a163c3---vupunukuruk.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/sabukogolinoxomozopobuze.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_off0000c4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 17080 bytes
SHA-256: 9e73ca3a1a9e136e46504672b9f2579de3068234259fc65710555af25dbf0918
font_02_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 11080 bytes
SHA-256: abc84542aeed1a14bab7ca49a9f82518b1bdde4aaf595b971dcaeca3ebdccb78