Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5c8416c2d07a17…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 01:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57b47b3ad639d50051db71ea9eaf2898 SHA-1: eb7fa0b0c672ee48a7ad4d2e6b9507a23bd74e0d SHA-256: dc5c8416c2d07a17511b5503f2397e9680f610c50bfc0c18abc1e947bf4162e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a large number of embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the overall structure strongly suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=yo+follower+apk PDF link annotation
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pq9b4tbsruc1cbl04uvasra8c0/rajilesigolibezonufaxifet.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/biputixelivogijako.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/zumokite.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/82181664459.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/golufawudixopizemufidafa.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/bogozanadogukilovidajan.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/xusoregapopuvose.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/56166008287.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/81356084600.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/vejagarafezeguzedu.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/18136416094.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145717dc18ed---96505623089.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210903115538214491.pdfIn PDF document text
    • http://happy-land.hu/editor_up/sevumedepatekusasebitabip.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/37605568111.pdfIn PDF document text
    • https://keongracun.org/contents/files/11145624444.pdfIn PDF document text
    • http://sayarbobinaj.com/file/jivugalaparejorevem.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/41355410594.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/9606895888.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/pulogimekikovigaganalawe.pdfIn PDF document text
    • https://blugarden.eu/file/51712698374.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/48428650334.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_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 17540 bytes
SHA-256: 446f2709ba4bf22935275fcbeedcb640b59fb0248be947676cd8d76e27388c0d
font_02_sfnt_off00012562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12562 10052 bytes
SHA-256: d4391ef9c3c0f7a00c442d4e719301bf032c8dce9a1b65f0df77b0e5bd979e5e

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