Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc278cd2400dc6c9…

MALICIOUS

PDF

70.2 KB Created: 2021-09-09 13:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 973e4806f8ecf38058449a927257f667 SHA-1: 32e47e3c51ba961899ede4ddb4b5b01c948ceaee SHA-256: fc278cd2400dc6c9b9c923ea5898c8ebf3ee8d3304b0bc77c68401a570804c81
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to host a large number of links on disposable domains, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://irlanc.ru/uplcv?utm_term=champak+gujarati+magazine+pdf+free+download PDF link annotation
    • http://webinaris.org/ckfinder/userfiles/publics/files/84113388087.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc7f86e1b---60535972763.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/jiwokavudaxebosinuko.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/waxividixabap.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/lezemuwidikaru.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/deboruj.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138c4b9c3857---77945439219.pdfIn PDF document text
    • https://buka.ru/sadm_files/4374978775.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/wimunixidupesuwixem.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/18360752879.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109082204359359.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/mukabetepefe.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/tabibumawavaxuv.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/xivariruvaxava.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/47531709556.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/jigiwapivowifuduki.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/59069998089.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/50896115614.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/92974692917.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/24258612542.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/xirunagurizamolu.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/sobifekexejetawililug.pdfIn PDF document text
    • 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_off0000b26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA82 11276 bytes
SHA-256: 7b3caf244ef3be7cd84d3d23402d50d42b2369440ecac67e4012d1aab28ab7d4
font_02_sfnt_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 15108 bytes
SHA-256: d606928e1611b6d27db47ddbc206a23d1244d3c068a48e3a4a2e4b25ba3f44c7

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