Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99c2015329915c9…

MALICIOUS

PDF

94.5 KB Created: 2021-09-14 09:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad0396fefed07340c09ae20f849ea6eb SHA-1: 15973fc5c207fd958f9d410c2e032521bc823055 SHA-256: e99c2015329915c97d9fed9f24243be5af8065a10bd30111c6c475e6123595df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one identified as a link farm on disposable hosting, suggests an attempt to redirect users to malicious content. The heuristic 'SE_CALLBACK_LURE' further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614021e2e4d70---digisobobamubidesebu.pdf In PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/29803462222.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/86315828402.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/43231079715.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/selinamuxozoge.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/30661250058.pdfIn PDF document text
    • http://indexone.ru/upload/file/32016838601.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/81482737229.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/balejajixujerepevinexome.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/nufoxefa.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/kitaje.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/dujifazowidotupe.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/sujavufavovotisozavan.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/79433569247.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/79509636073.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/vegilibewelebajefinazim.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/zagabupikuwil.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/80959234764.pdfIn PDF document text
    • https://wecareprogram.org/images/file/50084186547.pdfIn PDF document text
    • https://o-dance.com/upload/files/rovujuf.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/fufafulawe.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/35170929314.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/famitiriwiliri.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161353cc08dad9---varumodizapabanafoluvetox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pubg+obb+file+folder+namePDF 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_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 21936 bytes
SHA-256: d8ff41aa4b715ea2990b41aaa2e53615a52af7d65732d3a5753999f8884dd98d
font_01_sfnt_off00013ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB7 10672 bytes
SHA-256: 47692386c2117dce6848a44ff76972a44c3933cce946723639083753971e2511
font_02_sfnt_off000152d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1