Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2625ed7e72fca1…

MALICIOUS

PDF

87.0 KB Created: 2021-03-11 19:35:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1435bb0352133066555df84e43acb61f SHA-1: 81dd718c4489c4eac788c7f1c647718b0a5e7854 SHA-256: ef2625ed7e72fca1292f450c6260d7ae32cacceccd0f20aa664807961cc2127b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a malicious document, including a high ML classification score and ClamAV detection as a phishing trojan. It employs a link farm strategy, embedding numerous external links, with one prominent URL suggesting a lure for job-related content. The presence of a 'download button' heuristic further supports the intent to trick users into downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/award?keyword=bengali+job+newspaper+in+pdf+download
    • https://cdn.sqhk.co/vafizolubev/jiHPIih/rowdy_wrestling_mod_apk_all_unlocked.pdf
    • https://cdn-cms.f-static.net/uploads/4417033/normal_5fd91108f2fc1.pdf
    • http://zavodtriumf.com/solving_literal_equations_worksheet_answer_keyswtcn.pdf
    • https://cdn.sqhk.co/pabefidinaz/djcRZLs/dedaz.pdf
    • https://cdn.sqhk.co/regavebike/vrhdnUa/boy_hairstyles_long_bangs.pdf
    • http://ch-bewertung-2888.xyz/42878866360qd923.pdf
    • https://cdn.sqhk.co/zetanitanedo/ia4Ligc/86173298617.pdf
    • https://cdn.sqhk.co/romemanir/vgiji3K/topedejetozegi.pdf
    • https://cdn.sqhk.co/ropikenetu/gdDgfj7/yelp_for_business_owners_cost.pdf
    • https://cdn-cms.f-static.net/uploads/4427103/normal_602ac0180f798.pdf
    • https://cdn.sqhk.co/fakodozug/hdahgjc/91736334449.pdf
    • https://cdn-cms.f-static.net/uploads/4393348/normal_6027011f357aa.pdf
    • https://cdn.sqhk.co/vikoparif/5OduSgc/lagowixofutazodi.pdf
    • https://static.s123-cdn-static.com/uploads/4416928/normal_5ffa334feef3e.pdf
    • https://cdn.sqhk.co/vemetafije/azifhfN/photo_collage_maker_download_for_windows_7.pdf
    • http://runmasten.online/dirt_bike_racing_videos_youtubew80s5.pdf
    • https://cdn.sqhk.co/xuwolegu/hfJIg6w/blue_balloon_flowers_for_sale.pdf
    • https://cdn.sqhk.co/kugefiruxat/LDHieV6/galalimetafokabanupalikat.pdf
    • http://chelamela.org/10942015094zuaew.pdf
    • http://freefire-gifts.com/21762984491ygsnj.pdf
    • https://cdn.sqhk.co/pelopuxi/6jjejjd/beyblade_wonder_valtryek_coloring_pages.pdf
    • https://static.s123-cdn-static.com/uploads/4476302/normal_60078c9bcf206.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_272cc47441fa483dac086c16dac787a3.pdf?index=true
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_655a773ea64442ba9ae59200cdd316e2.pdf?index=true
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_fde7320c47ed481a854331d3defd3e44.pdf?index=true
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_76c643bb73664052b5aefc6344a991fb.pdf?index=true
    • 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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edad.bin
d89dfd4f407543ed411a39133ce4a8196b158d659f640e3dabf041af8186f3bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 5564 bytes
font_01_sfnt_off000100b5.bin
41235ab70be9fa3f12e47cad8e845f52309a50b4c0f8e13e14335179ba1e7532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B5 10188 bytes
font_02_sfnt_off000121cb.bin
5e1229d65bac0a1a8bbf90ce4eb32af2ce902c852d48ae1ed48d83b1de926286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121CB 13188 bytes

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