Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8a1ad22a4f1803…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 16:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 33ca1644b87aab6861d56792b3ec8665 SHA-1: 9c6602521286f4c641486840fc631bb3918dcb36 SHA-256: 3f8a1ad22a4f1803afd1511165d13778333117bb5b53575d8a76660529e38f68
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://primer-spb.ru/files/files/84849435031.pdf In PDF document text
    • http://laclonghotel.vn/upload/files/kinofixifedakojesoze.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/jobuvinuruja.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/81214357817.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/75222952084.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/fiwudejovupuritaxeken.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/vibubitok.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/30242665478.pdfIn PDF document text
    • http://infunplastic.com/d/files/zulupedarukusalobuk.pdfIn PDF document text
    • https://businesslife.com/content/file/51592932415.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd843e0c47---10776699101.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/75258500226.pdfIn PDF document text
    • http://baoveantam.info/upload/files/gusudofiwexubof.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/fapifejat.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/72270620023.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/dogigil.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/75448997427.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16141762f657ef---12385825375.pdfIn PDF document text
    • https://mklaassen.nl/images/file/katek.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/xidufigiwutemusuzim.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/zedepevovumu.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/bewogonivajinapapukorano.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/xijodizabagafusoz.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/43128038439.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/lelerepuberoxotiwiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=harry+potter+1+full+movie+in+tamil+download+tamilrockers+hdPDF 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_off0000b3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC04 11388 bytes
SHA-256: 09867c7e868566f1877a258d4df36ec1613b07956e33c04d88bf0676d2f59fc7
font_02_sfnt_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 15684 bytes
SHA-256: d65ff1797e6099c7f51c8f6eea535f5890f1062a46e03eb10e985d38f7a27654

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