Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a0c4d020eb46b2…

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 06:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b16eed17210efc57f590c5fdcf6ded9 SHA-1: ccddf35a5775a07796aa050882a759498626d965 SHA-256: e8a0c4d020eb46b2eca163478e44617927b6fdfc7a47c3a7be5446dc5c9588e2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a network of links hosted on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://nowator-zpu.pl/userfiles/file/lovupuxukubuwe.pdf In PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/zidozavavelen.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/48377820022.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/17bbd07ed799d7622b8d1c201e2a1f97/83290632734.pdfIn PDF document text
    • http://ge-mak.com/files/4036525691.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/danuzusat.pdfIn PDF document text
    • http://th-hl.com///upload/files/18522242105.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/jetewosisel.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/kupimopad.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/37329336888.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210907165604.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/godowekawamuzofigiz.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/ninenetopu.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/54826417090.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91311535808.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/todivak.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/falesazakafeg.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/jiluri.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/73169171582.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/ludarinexuw.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/15856458419.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/fepafuzukujolufivuxavi.pdfIn PDF document text
    • https://heyratacademy.ir/file/kumos.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/26349150823.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/xinoviwuzenomemonibare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+download+minecraft+1.16+for+free+on+androidPDF 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_off0000bcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 10832 bytes
SHA-256: b66e8e990c72aa3955c1d3dac8d9c48117b9c89bf75f34bb0628f71f1f970b8b
font_02_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 15864 bytes
SHA-256: 85277ac48264a9a8bc596fbb612d7531375dc35f860a44b7b92608a8a5dc871a