Malicious PDF — malware analysis report

Static analysis result for SHA-256 6021211b35ddd693…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 10:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c088552f168108ab0e10eb62e5804e0e SHA-1: 8ed5c5790fb1f1c3368dc85a796ac4f1c555c9ba SHA-256: 6021211b35ddd693e0ec3bf41184d7ed19c214cea941f2b9d26b8376a2e57588
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, some pointing to potentially disposable domains, and the 'Urgency / deadline lure' heuristic suggest a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://asztalosweb.hu/userfiles/file/kanibijizinenipiso.pdf In PDF document text
    • http://technocom.pl/editor/file/40257070820.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/tusunefiwok.pdfIn PDF document text
    • http://maulich.vn/attachment/files/83197418789.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/84253355172.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/62024554450.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/litezikolozavajukonileson.pdfIn PDF document text
    • http://contextuae.com/resimler/files/19071509336.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630495075/files/tidolabolijoloxanaje.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/wewimaku.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/bazovivururifapijipedofaw.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/tezale.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/75921873551.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/46003141508.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/60450612942.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8b2a7b5f066f31ec427f44e6e3707ee9/juxigefukod.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/jezuzewelopozugekupe.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/95422488129.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/49025385646.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lujusirisajedomigexafuna.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/batazosamogam.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/97041308579.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/49981713421.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/40327276426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=shadow+fight+hack+max+level+99PDF 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_off0000d20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20B 11140 bytes
SHA-256: 4386504c4c95f5ccfbcaadaebcbcb7e0c40532834fb90cba53d41b7581c27c00
font_01_sfnt_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 19416 bytes
SHA-256: a2840e1ca353d3f7e8af88ab06dab03c74fe9d6c29a6a10120ccc3ac4f843966