Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3de55dda079ad88…

MALICIOUS

PDF

94.4 KB Created: 2021-03-15 11:15:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fdaf352439c87ae73251ba7ea32cf326 SHA-1: ec2fed6ddf73da3821277cbc7f8910dcbb8e8c69 SHA-256: e3de55dda079ad885b10284b1d139ddb365ed16cc366fcc10cf33d293b362eb6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/strik?utm_term=al+quran+audio+urdu+tarjuma+mp3+free+download PDF link annotation
    • http://texoraw.sportsontheweb.net/what_is_taco_bells_new_5_box.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/lather_and_nothing_else_main_idea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_6013c08fe4978.pdfIn PDF document text
    • https://cdn.sqhk.co/zutigaku/nbChajb/talent_manager_idle_music_clickers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410432/normal_5fc6c4c334745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374519/normal_600f580e20eac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492275/normal_5ff696ed649d6.pdfIn PDF document text
    • https://xakowuval.weebly.com/uploads/1/3/5/3/135316831/tumebezuguta.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/bUihOib/wood_craft_supplies_wholesale_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_6013cda0c7cdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379855/normal_5ff0b20192198.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/97053.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/puvopositema-wedebimenaja-valibodakevam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456712/normal_60432c736ca29.pdfIn PDF document text
    • https://vigoruso.weebly.com/uploads/1/3/4/1/134131386/towogopafapitin.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/BggCvhh/kikifofane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457843/normal_60249a4fd4af4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8f4893-de76-489d-aeef-817fa86aba5c/queen_bohemian_rhapsody_piano_cover_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33b6f5e-42e0-41d5-be99-f2ffb490ea05/julius_caesar_act_5_scene_5_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8780bcdf-63dc-4e22-8410-bb741dc44fb9/mupusanirodorasutumuvizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b22e43af-a2b9-4268-9046-08a132498a8a/2019_toyota_camry_hybrid_se_review.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013a92.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13A92 27708 bytes
SHA-256: d289acf4deee72201a1d7019b35e14acd99481bf6d7e1d8030f8cb3f6c512934
font_00_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 5456 bytes
SHA-256: d73cc8f8fcc78fa5487756199f20fd175232619e9de0cc889487e259f4aae9e5
font_01_sfnt_off000116ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AC 10448 bytes
SHA-256: b5441a6e1e30dbcb86a23bcf3ee83d1f5cc253ff4a5620ef2c4f55d3961b4a73