Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42a3575fc03090d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 16:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 25e2d5ba9b3d39d8220df71a3c57a8b4 SHA-1: 99d4aeaa2043dac0abf141e3f4c720cead442581 SHA-256: d42a3575fc03090d12766b9f2e4e3f61695e7cb78785075e890224edc4780510
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document is a link farm and contains a callback lure, suggesting a phishing or tech-support scam. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving the embedded URLs to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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.
  • 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://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/1709513120.pdf In PDF document text
    • http://z-sinpro.com/upload/files/65283508432.pdfIn PDF document text
    • http://carbonelite.ru/file/fajeduluv.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/33664287085.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/wubuxajexivosebege.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/38135861220.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/78686804555.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/javomu.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/worexakawube.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/tupaxufimor.pdfIn PDF document text
    • https://fishuntpesca.it/file/57305397766.pdfIn PDF document text
    • http://carbontuning.ru/file/41761149774.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/77468889847.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/31053204735.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/58975263003.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/23769846257.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/48423462650.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/49164225991.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/sujakutaji.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/7622106562.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/bakafutab.pdfIn PDF document text
    • https://robertbah.si/files/file/70591066563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=present+continuous+tense+exercises+pdfPDF 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_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 10608 bytes
SHA-256: 0df125fe3ce5b72ff92a26f6ad1175b657c81088d3713a92764d9d9cda201a61
font_01_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 18140 bytes
SHA-256: 12247b1eef8f21c9966b6c1a32efcb739317bcbeb01016715c15838713185078
font_02_sfnt_off00011cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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