Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c9b1353ee00150…

MALICIOUS

PDF

72.2 KB Created: 2021-10-08 16:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2c5ee83f3b403c5d2fe05f2b78f2c240 SHA-1: e794c25b56b07499ffaedba025b29b5f69535eb6 SHA-256: 47c9b1353ee00150e95554a3fd8811e5ff7bf788666820dfe07fd1ce31bf2073
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also functions as a link farm with numerous external URIs, many pointing to unknown or potentially malicious domains. The embedded JavaScript likely facilitates the exploitation of vulnerabilities or redirects the user to malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://karczma-zaborow.pl/userfiles/file/52250922049.pdf In PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/68432263973.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/bifaneforikexanuvene.pdfIn PDF document text
    • http://benrassam.com/uploads/files/zupipitesavaranuma.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/bufitifiripolaz.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc8f988f72---37102512079.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/77986410881.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/zesujisezobod.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/90156336075.pdfIn PDF document text
    • http://sireny.net/share/files/44478270460.pdfIn PDF document text
    • https://mollis.rs/files/13877187798.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/7986338258.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/68969179472.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/bupewag.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/beruzifotomigave.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/68433724197.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/98122245191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+to+do+when+i+lost+my+iphonePDF 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_off0000b85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85D 16532 bytes
SHA-256: 45bdbdd2d69d3f55ecd748795cfe1f458b4878349948ef574641c6b32ce79bf1
font_01_sfnt_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 10748 bytes
SHA-256: a53aceb5b047f70580c78d2e84be5454f13cc645adf22eda6084b0e9ff4c1e24

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