Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ec7e2fdd434477…

MALICIOUS

PDF

89.8 KB Created: 2021-04-04 04:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea8c5799e1e645100a16853fed47e8f6 SHA-1: c24f91de144e1bc2cb97c47c0b404ec9cc434610 SHA-256: 75ec7e2fdd4344771bcaa70d78e38761c92be74fe2c4b8a9a7d2a65da4b808ad
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains a large number of external links, indicating it functions as a link farm, likely to distribute further malicious content or engage in SEO spam. The primary malicious activity observed is the mass generation of external PDF links, suggesting a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/award?keyword=abdomen+definido+leandro+twin+pdf
    • https://cdn.sqhk.co/ruwonumatag/PCcheib/versace_chain_reaction_red_white_and_blue.pdf
    • https://cdn.sqhk.co/pikuworano/gETghgd/german_word_family_dictionary.pdf
    • https://cdn.sqhk.co/xefijumu/haRiUfX/brandy_piano_man_lyrics_video_download.pdf
    • https://cdn.sqhk.co/purorenutuw/ii6jmji/rap_beat_creator_app.pdf
    • https://cdn.sqhk.co/pivokazi/Diijhji/jesav.pdf
    • https://cdn.sqhk.co/kululojilo/ihdjjkD/fundamentalism_definition_us_history.pdf
    • https://cdn.sqhk.co/letarezetap/qCFbfIF/free_funeral_program_brochure_psd_template.pdf
    • https://cdn.sqhk.co/bibikodazit/gepibbI/twisted_wonderland_characters.pdf
    • https://cdn.sqhk.co/rubutemoxe/O7gdgfo/finger_spinner_toy.pdf
    • https://cdn.sqhk.co/zuxolusufa/DuJxidV/pazofefebezod.pdf
    • https://cdn.sqhk.co/texirova/ie3RN0v/3d_puzzles_disney.pdf
    • https://cdn.sqhk.co/xafeperale/aox6ge0/69141228219.pdf
    • https://cdn.sqhk.co/feketukadoz/gdwjaGj/28292860036.pdf
    • https://cdn.sqhk.co/gimexigerub/IREjfaM/56064205780.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_a9063a49a2e345719a18d3aec53c2d0a.pdf?index=true
    • https://s3.amazonaws.com/dezajok/73988315025.pdf
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_8c99b4f5c8694c85a9d3a8501b87a941.pdf?index=true
    • https://s3.amazonaws.com/gofilafixu/rudram_namakam_chamakam_in_tamil.pdf
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_ee7390c3957349ea88fd6fa6c2a5be98.pdf?index=true
    • https://s3.amazonaws.com/nosepevozux/biozone_answers_unit_1_and_2.pdf
    • https://s3.amazonaws.com/belapawerezuju/how_android_auto_en.pdf
    • https://s3.amazonaws.com/latufenaw/xekifudumewepe.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_off00010722.bin
1b1fd4a5c35124e14b67df41361b0dd628b945a8fd0a3741b44612ca95d4e954		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 5228 bytes
font_01_sfnt_off000118e4.bin
fdfe151ea87bb195803751b42fea6734f7ff5ffbaf55059d696dd1ed8f5304a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 14032 bytes
font_02_sfnt_off000142aa.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142AA 16204 bytes

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