Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa187cb3b693f90…

MALICIOUS

PDF

85.9 KB Created: 2021-09-23 14:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2b66e11bc56c61d22ce5bae2ee62b7f9 SHA-1: 4460279474d222df5feef5ba77fa61b95ec462bc SHA-256: 1fa187cb3b693f90d6e30d4d3cdb5aec3a70d99e9798f532679e4b8a8bf745f5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user to potentially harmful content or initiate further downloads. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document's content is designed to trick the user into initiating contact. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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://studioesflores.pl/obrazy/file/goxipujubokusevinamit.pdf In PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/libugofobedererik.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/volivariwazemiko.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/sozitimora.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/12823822809.pdfIn PDF document text
    • http://imbirimbir.ru/files/4851067099.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/zagujasen.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/nakanefefumizetozifaw.pdfIn PDF document text
    • https://langumeistras.lt/i/File/50761444040.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/sirafogijavejoniwozomem.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/piwukokeniviz.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f6a591455d295fcb460123cb3c77df79/nenumatagitedapuked.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/85213344548.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/tojatami.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tugagavem.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27834218535.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/37682889668.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/xolebibirani.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/dokimunaforuroguj.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210920_665CD6A8690A5DA7.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=legend+of+korra+season+3+streamPDF 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_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 19896 bytes
SHA-256: e998d48cd2dfee06d09066dfa6a55bd3cca7531ac708463f2034a1812314f152
font_02_sfnt_off000131f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F3 10780 bytes
SHA-256: 1b8eda6ca709634118bd65ae28544a43a819dd70e2a9c89342ca518c8ea7bdbf

Open this report in the interactive analyzer, or submit your own file for analysis.