Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a624b8916064886…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 22:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12742d1d13a7e3ce7a90820a52c3ff1c SHA-1: fac19d7bd629200bc46f513b81abd7c02e5c74ab SHA-256: 2a624b89160648867444221578df764385f531aee3b044304db2c21fbe4ff0fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=device+information+apk PDF link annotation
    • http://fortwashington.abwingsmd.com/uploads/files/vixedi.pdfIn PDF document text
    • http://net-work.cz/data/file/dusabovud.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/93929955595.pdfIn PDF document text
    • http://analhospital.net/file/files/73823924822.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/rejafoxalefurirumegojezag.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/54792889900.pdfIn PDF document text
    • http://esangsok.com/upfile/files/tuwatepiko.pdfIn PDF document text
    • https://33mobility.net/uploads/files/nenopupozonosipumig.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/35135413249.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a36c6defc---widovurudifozexudavo.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/41139447665.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/33828636399.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/jilunodawopetul.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/galolafipurumimev.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/3579787202.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/50435865633.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/sipaxapagetigo.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/bapufifoxojidavigo.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/najogebipof.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/s75a0u5bpjeekva2o6b2o39qei/79911136566.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/rewuruvubisugumikeke.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/namozejetisav.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/82345960728.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219973286691.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/76324252630.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_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 17188 bytes
SHA-256: 476b85517ec8e961d586c504cc7bc301163117e2d2d51e6d84990dfa1e84d4c9
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 10588 bytes
SHA-256: 139ddade2ce914b06fe3bf1b92e94c6696f7963b562ba0e6f020f93cac0b7029

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