Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c2e7bde787ddb8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 16:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f65629ba86e97166b73ee5a41b3b218 SHA-1: 53d0f359e79bc43af87e648361001d234708a28d SHA-256: f8c2e7bde787ddb806e6aa56c04da578540a2cfd4bb743eed71bcf5fbb29fa2e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on unknown domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://marljivo.hr/UserFiles/files/ferisukijezubogilijuvu.pdf In PDF document text
    • http://rymwid-training.com/userfiles/file/jogededobakofogugog.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/javitolukuxekizazidi.pdfIn PDF document text
    • https://toocapen.com/files/powixe.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/7318797945.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/wivoxedisenekiberuvesul.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/sipikurobi.pdfIn PDF document text
    • http://p-energo.ru/content/file/37740242522.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614227dca2e25---37618608915.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/12629958671.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/minidugo.pdfIn PDF document text
    • https://goodline.by/userfiles/file/60688356867.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/93669989246.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/39220995344.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/62374517225.pdfIn PDF document text
    • http://darec.sk/files/files/86966702504.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/toloposafazudopinibafam.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/75435183170.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/javiraruve.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/tomiwijafozejofe.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/timupesojavo.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/tepirezenikebujotumupi.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/kijigivubonobexas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=50+shades+of+gray+book+read+onlinePDF 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_off0000d6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 11040 bytes
SHA-256: 9fbd7ce241e2c5a60753f5a0396ec8b0f7ef6f644da06b52b763aebda8d384b6
font_01_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 17480 bytes
SHA-256: 55023980033e0570b48fed40d93f0d8e6c1f034068209ffe6fcd665bcbb82bf7

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