Malicious PDF — malware analysis report

Static analysis result for SHA-256 84822d1cc1c1a9fb…

MALICIOUS

PDF

80.1 KB Created: 2021-03-25 06:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2114dba3665cf6c0a52bd27899ef589 SHA-1: 6a0dab0504a517f6bd2602a20a08a38d8f0a502d SHA-256: 84822d1cc1c1a9fbc22e1e513af7ad0c37a5ee8062be55c95302bba3ae3fe867
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, yafferge.ru, which is likely used to host or redirect to a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to exploit users through a phishing lure, likely leading to a secondary download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/123?utm_term=clash+royale+free+online
    • https://cdn-cms.f-static.net/uploads/4426945/normal_6009fe97b4db0.pdf
    • http://theplafond.xyz/kill_team_rules_downloadxcx7n.pdf
    • https://cdn-cms.f-static.net/uploads/4391621/normal_6018417cebe83.pdf
    • https://static.s123-cdn-static.com/uploads/4384159/normal_5ff79028dc202.pdf
    • https://cdn-cms.f-static.net/uploads/4447915/normal_601bab414eea7.pdf
    • http://erogan24.website/4627686241xngzj.pdf
    • http://bristol-yalta.run/liberation_theology_and_marxismvxsks.pdf
    • https://cdn-cms.f-static.net/uploads/4378830/normal_6037bbff31b27.pdf
    • https://cdn-cms.f-static.net/uploads/4495265/normal_6026c8988a48f.pdf
    • http://liketsven.xyz/sotatigizazudokuruzelimuk900.pdf
    • http://zaxegod.getenjoyment.net/jerikegogupopob.pdf
    • http://yoga-italy.space/41166070614hmcll.pdf
    • https://cdn-cms.f-static.net/uploads/4482190/normal_60557f1200bda.pdf
    • https://cdn-cms.f-static.net/uploads/4445118/normal_6025a5fb59b6b.pdf
    • https://static.s123-cdn-static.com/uploads/4420599/normal_5fe0332d6117a.pdf
    • http://zavolofa.mygamesonline.org/livro_energia_e_meio_ambiente_download.pdf
    • http://defi-bet.world/how_to_reset_linksys_e1200_router_password6ujsh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://penobugixova.atwebpages.com/32192084023.pdf
    • http://wazeniwemir.onlinewebshop.net/ff7_remake_length_vs_original.pdf
    • http://bamonoxo.onlinewebshop.net/63556457397.pdf
    • http://kuwitabetegipo.myartsonline.com/levuxewiwawikudupij.pdf
    • 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://scripts.sil.org/OFL
    • 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_off0000e78d.bin
1c2f20188373eb7ce410ef6fbbd8e9495e3d3c84f02d94a6d6820fb38d7c4142		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 4864 bytes
font_01_sfnt_off0000f814.bin
c86591f5333d670cd745f9ddafb86a761e47ce4684053462333d0d25a0dde770		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 11036 bytes
font_02_sfnt_off00011deb.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEB 16204 bytes

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