Malicious PDF — malware analysis report

Static analysis result for SHA-256 9208941c131d5540…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 02:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39b2840d6034a85ec58df805dad1560c SHA-1: 0573f71da0bd8290751a2f5370d8ad3ce7443b96 SHA-256: 9208941c131d554072fa27bc35988cb306a5018915d247d157d4904ef96fcc00
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and multiple external URIs, including one pointing to 'coretry.ru' which appears to be a lure for downloading a file. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://coretry.ru/uplcv?utm_term=the+amazing+spider+man+2+obb+file+download PDF link annotation
    • http://ciba.lv/uploaded/file/fodazikoz.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/tesetekijeb.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/68555950437.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/88794665004.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/43742140015.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/lenevowitosuvutulul.pdfIn PDF document text
    • https://grancom.by/upload/docs/44060937924.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/vuwawewusutitebexikitu.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/lurigorefisuxemuwibeg.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/86483379854.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/71723890020.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/rumoxojawuxiwazu.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/setogamapojefopexama.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/76409768433.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/soxaxerujipe.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/mafowemukurokofozod.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/62659214230.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/80653594357.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210923_D679BD045E4C5C82.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613215198ec3f---ginizilemamalurazujawemik.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/89136330703.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_off0000b070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC887 11216 bytes
SHA-256: e354d56d6bf26afc5fff5e3b0d313be3b7a35ca1c68f3f08e62ea458c6ff590a
font_02_sfnt_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 16272 bytes
SHA-256: 8d2fc8071b6528fc9160a4eedb4c7fa5915a0e19c207f2751ba0dfaf6511f014

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