Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb8e900f321041c…

MALICIOUS

PDF

88.8 KB Created: 2021-09-08 18:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17a9e0e6842f9ce4ec939d69ede42ac4 SHA-1: a914cf7d1e6b9f23b8eea648572a804361fef03f SHA-256: 2bb8e900f321041cd83427a74aa8472a207308c83b2e3be9f00303296c19dab9
174 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and a high ML score, indicating malicious intent. The embedded JavaScript and the explicit instruction to disable security software strongly suggest an attempt to bypass defenses and execute further malicious code. The document's structure as a link farm on disposable hosting further supports a phishing or malware distribution scheme.

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 http://precedent.by/_newsite/images_from_html_editor/file/3667217693.pdf In PDF document text
    • https://avigailpekelman.com/sites/default/files/file/2311133358.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613174a53a369---tamakevelumer.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/robesovipuwonuziz.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/kipigivejixutewusorar.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/88525125170.pdfIn PDF document text
    • http://hevolta.com/upload/file/27038529637.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/rotifunasijo.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/volene.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/wizunime.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/mebilunetalenarijesadu.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/vexurugujukewasusudesumax.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-7/20210907231520535241.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/51570518354.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/80698822640.pdfIn PDF document text
    • http://alltechsro.cz/files/93001750268.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/30925572155.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/22605791350.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/dumisozusivesege.pdfIn PDF document text
    • https://fultoys.com/userfiles/majakanepobaloxalaw.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210901061839.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/sizuxok.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/seleparagajik.pdfIn PDF document text
    • http://prosquash.by/data/84569990832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ubnt+edgerouter+lite+manualPDF 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_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 18792 bytes
SHA-256: dac017561b136e1ee2a5e899607e9dadd5a31a427cdf7bc3d6a1f8d020e36fbd
font_01_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDD 10672 bytes
SHA-256: 9aa7cbe39cc150004507a214c423c9687f44b2eed81e7adf21bf724e78d4a2d7