Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d133b5b8ca886b4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 14:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9fc91b83ee79db6694a771296884395d SHA-1: ab1829e115dcdc06086db2c599657e46fb4dccab SHA-256: 9d133b5b8ca886b4dfc1f79d036d733c6eda7cf069228ca216cde49ef224859b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm structure. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document likely prompts the user to call a phone number. The embedded JavaScript, though not fully detailed, is a common method for exploiting PDF vulnerabilities to execute malicious code.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://szintai.hu/ckfinder/userfiles/files/72903995944.pdf In PDF document text
    • http://dautuck.com/uploads/userfiles/file/24302353798.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/wapoguvopiweburaletes.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/72610407997.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/38638138008.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109181917522011.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/dujazuzavidaxuragi.pdfIn PDF document text
    • http://infosierra.es/images/editor/84853995887.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/70189930559.pdfIn PDF document text
    • https://landi-bg.com/images/file/31148725397.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/27721962481.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140045315e7e---nujajowomuzobavovogi.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/bulowikeparufosumukira.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/96963066879.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/8859611763.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/23714361642.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/76862108656.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/60899269983.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/80860210279.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/112220288032.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/56558213707.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/85368717786.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/tawupizoxepusu.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/naluvilomofupojupajemolak.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/13472402576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+the+social+dilemma+online+free+123moviesPDF 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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 11144 bytes
SHA-256: a2d4c8e07ca51cf1a40f778a43605bb66847944c7a95ef49c2d2c5a6a2bd7e41
font_01_sfnt_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 19776 bytes
SHA-256: 8bb8fb392ea37af38ee8379987e4e25050675ddc0bb94aab285f43a04a8324bb

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