Malicious PDF — malware analysis report

Static analysis result for SHA-256 298bfe7ab3e4c7b4…

MALICIOUS

PDF

75.8 KB Created: 2021-03-29 13:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a191168df019ece16e091b107cac16d2 SHA-1: b45285ed7e51b757c56fc9f6ba6bb3d6f1b14187 SHA-256: 298bfe7ab3e4c7b4e43573f7d9b0e6586ebb07ae3336428f5d2414e5eab2968d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to unknown or potentially malicious domains, indicating a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=how+to+reset+display+on+samsung+monitor
    • http://vemazewikale.22web.org/50102402151.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a06365e5-67d9-4ac8-b906-904e64771d95/2020_ford_mustang_gt_700_horsepower_blp.pdf
    • https://uploads.strikinglycdn.com/files/62dd7856-2dda-4a3c-9fff-e7d90c124072/pl_sql_developer_jobs_for_3_years_experience_in_bangalore.pdf
    • https://uploads.strikinglycdn.com/files/49cd7805-4e77-4ce2-8b39-6d8844e78e25/never_fade_away_cyberpunk_song_lyrics.pdf
    • http://jevoneloz.epizy.com/valores_civicos.pdf
    • https://uploads.strikinglycdn.com/files/631d96d6-b218-401a-ba76-fbc435d27b50/44362220555.pdf
    • http://gigixago.epizy.com/yanni_nightingale_piano_sheet.pdf
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_ac0692aad18f41109de8f3631124a9ab.pdf?index=true
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_b236d926fd0745288dc364d19e350f7c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a3a0b84e-8faa-4146-b331-d5beeafd29b2/shark_steam_mop_s3251_pads.pdf
    • https://uploads.strikinglycdn.com/files/0991a1be-60fe-4909-b85c-43aec1c33090/danby_ac_window_unit_8000_btu.pdf
    • http://mevetilozavasep.epizy.com/mapa_fisico_politico_de_argentina.pdf
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_c26ac02c5f224db79692d24aa206cc84.pdf?index=true
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_a92bc44bd7814919ad5e3a88a8e10342.pdf?index=true
    • https://uploads.strikinglycdn.com/files/20057bfd-a7d0-4396-83ed-579a69b891ac/vifaramabodibulid.pdf
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_15d1011eaf05413988e0ba5930e8d538.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d22c09af-b823-4fbf-b803-7dfcc5bfe890/momegavigokiluvelegulub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db3e.bin
b41306e5d33d03fd41ca28f990d16640fe0ee9de657f45da3de52f515ff6e2d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 5316 bytes
font_01_sfnt_off0000ed4b.bin
ec38f5678d6b677cc191bfea3481712835d548c7dba2ee561c38caf2b92dc319		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 11592 bytes
font_02_sfnt_off000114ae.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 4324 bytes

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