Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bec87d292bc512…

MALICIOUS

PDF

78.5 KB Created: 2021-09-21 17:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10310d46ee68db590dde14ada5359dac SHA-1: 9f967ad379086887ec0c276950550de91d8ec8e1 SHA-256: 97bec87d292bc512cac34a65980ec625ea61cfb54200d5b3a7cc947e6e89c454
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to suspicious domains and structured as link farms, suggests a phishing or social engineering attempt to direct users to potentially harmful content. The 'utm_term' parameter in one URL indicates a potential lure for app downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.globalnautique.nl/upload/files/xewelivawabilegadejiwemo.pdf
    • http://kraski-chernila.ru/resources/file/tibovina.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/16652719717.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145201977329---toredefoperirodowon.pdf
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/sidunozosifo.pdf
    • https://produktybhp.pl/pliki_user/File/mapepudejulupozutukiw.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/14431625484.pdf
    • https://pmrmhss.com/userfiles/file/87735253763.pdf
    • https://greengenome.in/admin/userfiles/file/remunobituzakabazot.pdf
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/verijefazebejodenulita.pdf
    • https://vanphongphampmc.com/upload/files/sogojo.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614949e9276da---vimolubum.pdf
    • http://taxfreepoint.com/file/54407666978.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/wupoxasonafunev.pdf
    • http://ijdssymposium.eu/upload/tijavowedojikum.pdf
    • http://malbreil.com/userfiles/file/63465981247.pdf
    • https://activsport.ro/userfiles/file/dedifenafedebulijolupata.pdf
    • http://okmarin.ru/userfiles/file/mujerofonewememawuja.pdf
    • https://eslms.com/userfiles/file/ninaposuvaxutetaw.pdf
    • http://damutech.kz/upload/2021/09files/210902132917979037ezts4.pdf
    • http://bighost.vn/uploads/userfiles/file/zobimu.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/xejulavutoluzuduvixuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=install+free+play+app+store+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d121.bin
51aaec43b9e108dc8a7ffeb5841f005e70e55c7c0fb47aeeaf1e8e30ca9c0581		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD121 16784 bytes
font_01_sfnt_off0000fc73.bin
a37898538e48e04d9168c18d74b0b4499944f50cbe33b017ed2391502a766348		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 10552 bytes
font_02_sfnt_off000114b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 16792 bytes

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