Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe2f67d4e715f4e…

MALICIOUS

PDF

75.9 KB Created: 2021-05-04 19:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 567d3a08520ed9fd153f8e9d41ac41c9 SHA-1: 324ec72fa9623deffac7d9ab021d762c096581df SHA-256: dbe2f67d4e715f4eb99424d3657606b3af4b81356dfef9861117adc8cada2732
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. The ML classifier strongly suggests malicious intent. While no scripts were extracted, the presence of external URIs and the link farm nature point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://botokaw.ru/strik?utm_term=the+landlady+story+ending
    • https://cdn-cms.f-static.net/uploads/4453721/normal_604937b48d349.pdf
    • http://dimax-matrasy.ru/59636263342o92mv.pdf
    • http://ergors.space/12743588473no0ln.pdf
    • http://bestpriceforukraine.xyz/28562550674jtc17.pdf
    • https://static.s123-cdn-static.com/uploads/4495271/normal_60067b145a13b.pdf
    • https://static.s123-cdn-static.com/uploads/4455197/normal_5fee5492a07fd.pdf
    • https://static.s123-cdn-static.com/uploads/4454424/normal_5fed424709bb6.pdf
    • http://cuzinfo.ru/lucky_looter_mod_apk_android_15sct0.pdf
    • http://pipvip.ru/monthly_expense_sheet_template_excel9xtzk.pdf
    • https://cdn-cms.f-static.net/uploads/4394077/normal_60240c43e601b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://verejepaw.epizy.com/parezomigurujeletokip.pdf
    • http://wofulagonem.epizy.com/astm_a36_steel_plate_specification.pdf
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_eda6afb9f2b445fba4cd9d0c5950e58a.pdf?index=true
    • http://xovipofeguz.epizy.com/gagonavikiwuberenofo.pdf
    • http://fufinekudag.epizy.com/bachelor_of_information_technology_course_content.pdf
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_6b06f188bbe247f6851b7321656a4805.pdf?index=true
    • https://965bd944-310b-4209-a71a-d16e45aaced4.filesusr.com/ugd/5f02e6_ddaf27e22ab64c9da0f24ca6c24c646d.pdf?index=true
    • https://s3.amazonaws.com/buganabowumujef/75885200929.pdf
    • https://s3.amazonaws.com/dinigugaxej/burrakatha_movie_video_songs.pdf
    • https://s3.amazonaws.com/negonanopix/easy_ukulele_chords_songs_im_yours.pdf
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_2e1c1c76de5c45579de18800b5bd4b20.pdf?index=true
    • https://s3.amazonaws.com/tirimofufemukat/kolkata_howrah_bridge_hd_photo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97e.bin
e14e85a63ff25cfb5bbb4416a5742585b5485ee75631393ad968e6d179b086cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 5140 bytes
font_01_sfnt_off0000fafb.bin
1a1df9187f05839e111bd9906e90bd75cd544f18fc7a4ee3a8927b611f35840e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 11204 bytes

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