Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc72c76c3c088b2a…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 00:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1de9e5b876401b201889ac9e4ea0a3bc SHA-1: e8ea5bd5fd9aded9236b6b68ad64b3ff4325ebe3 SHA-256: bc72c76c3c088b2a4572bd35d8814b2c3007a1c79495138da2b8c8a5167fe35c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external links, many of which point to unknown domains and are likely used for phishing or to download further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://reklama-kemerovo.ru/files/files/15628547446.pdf In PDF document text
    • https://shturnev.com/files/foFKED/file/xosuno.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/fopalovudim.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/vegebajixoxew.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/91200932622.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/walurokumerobotujifoxefas.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/zuvamumefajuwajo.pdfIn PDF document text
    • http://chpcentre.com/files/file/waguwesexu.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/23282226251.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/78342003219.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780e4daa85---77905934921.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/vovotesusuxijogagebip.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/1524570195.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/14136365896.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/jarixom.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/80809525721.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/jirunavibugapiwomojolefa.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/dogurugimi.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/80759987914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=instagram+auto+liker+appPDF 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_off0000aaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FD 16404 bytes
SHA-256: 56378483d1821aa977e859274a985aa010e388b9cc0c6ed10e6f3d77bb332d8e
font_02_sfnt_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 10736 bytes
SHA-256: 055ff8721641e068aca624f4a9c75d4f629650d78c0fad02ec7a28ad8a38d5b7

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