Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbdabf314383404…

MALICIOUS

PDF

72.1 KB Created: 2021-09-12 15:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 184dd6797ae786e9ea0ba5a68426a9d1 SHA-1: 673bd033d1552f8c2fc7cea143c67f9372e4fd40 SHA-256: 8fbdabf3143834047bf4f0d23332ed62ce39604e7be421c3d6875983cd9350e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggests the document is designed to host a large number of links on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2c62103b9---23152577692.pdf In PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/36180875.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/wopawubaduwigoparevadapa.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090609515273499.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/gitatuvizenijosubunalan.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/zamiwodibe.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/18741917763.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/74710864338.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/93492128456.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/27598959187.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/fufafuf.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/xakapatoxan.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/wapikukat.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/77188226612.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/78339409858.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/damumajifopeka.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/94160704719.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/43816896918.pdfIn PDF document text
    • https://penzion-palice.cz/content/89599982163.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/nejejuwox.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/76599623152.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/zaxonimexinibigiwog.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/72253455427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=return+man+unblocked+gamesPDF 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_off0000b71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71F 11000 bytes
SHA-256: ed7f8fe1a32e848944504be992f25e3253061f591435efec2a56fe27ac03c81c
font_01_sfnt_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 16260 bytes
SHA-256: 3626b8c07bf4677407a9e8845c49c1444b05b158ead9c4847a69e44a667ccbbc
font_02_sfnt_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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