Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90f6a0f0b554b58…

MALICIOUS

PDF

88.5 KB Created: 2021-09-17 11:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 102885e56f48c5872d75b8bb6f168d09 SHA-1: 415c5a7b1fd26cc2f6cb2e952a0f09cef592dea0 SHA-256: f90f6a0f0b554b580fa950c2f5f752c2e823b150257a6d4c07719a8bd68e1163
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URIs, many of which are part of a link farm hosted on disposable domains or IP addresses, suggesting a phishing or redirection scheme. The presence of external URIs and the 'link farm' heuristic strongly suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crewmak.ru/uplcv?utm_term=oxford+revised+the+new+grammar+tree+class+8+answers+pdf PDF link annotation
    • https://weyergans-hcc.lv/userfiles/file/91532655482.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/wumenotilapuzasoxevovofo.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/mezibazumafejevevefus.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/42793547593.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/99625795344.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/zijeni.pdfIn PDF document text
    • http://cortabellanews.com/userimages/80242532912.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/20409142143.pdfIn PDF document text
    • http://profstil.az/userfiles/file/devolopodonakukagiv.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143533ef2dd3---pelojuwufanugafufovotin.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/fejasus.pdfPDF link annotation
    • https://globalcareerclub.com/FCKeditor/userfiles/file/53116305500.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/gejarexiz.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/kolusojaxog.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/72998958416.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/mojitudakubulimuw.pdfIn PDF document text
    • http://xprchemical.com/upload/files/vukumipajonije.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140ad3c45f46---faboxuse.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/3093167449.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/55210225377.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/momidovoverubogepod.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/ramoxojazetefuxoligaso.pdfIn PDF document text
    • https://ka-base.no/images_students/files/59567200149.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210908215746_ha26s2.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_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 11552 bytes
SHA-256: 3cdaaff86b65cd99a5fa21fbe4e91be007fbc5aaaa5b14bc9db8dda27e6fc6f2
font_01_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 19000 bytes
SHA-256: e36476280dd549d8b7c1316f84840ef79e3ed4a5252ad9bf05fb1c87cd54b1ed