Malicious PDF — malware analysis report

Static analysis result for SHA-256 853d667cab419625…

MALICIOUS

PDF

81.2 KB Created: 2021-03-20 11:04:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 743d5254304890e272d5f579c6adb7c0 SHA-1: 959d0308ea7812da6d4f9517f48cef3af059f1da SHA-256: 853d667cab41962528a719a1173e2e72ee3b86f95a54cd11f3d190270ebd85c5
226 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The presence of a 'Password-protected archive handoff' heuristic suggests the document may be a lure to trick users into downloading an encrypted payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pelibifir.ru/strik?utm_term=ray+daniels+designing+great+beers+espa%25C3%25B1ol+pdf
    • http://viriruxik.22web.org/look_down_les_miserables_sheet_music.pdf
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/fepukemotabos.pdf
    • http://betmoy57.com/what_does_due_by_a_certain_date_meanzcexn.pdf
    • https://vumazara.weebly.com/uploads/1/3/0/7/130738753/dubejebijekufeperive.pdf
    • http://thrivewebs.com/vidmate_ing_movie_walan7a12.pdf
    • http://kraftmann.su/warning_flags_galveston_beach7tgc8.pdf
    • http://connexion-amelii.xyz/373258973597z72z.pdf
    • http://educationonline.website/gta_san_andreas_indir_gezginlerden14mdk.pdf
    • http://reduslimitaly.website/how_big_is_a_flag_football_fieldqwx3q.pdf
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/kabata.pdf
    • http://idealicaitaly.site/how_to_work_in_agile_methodologyjpeqv.pdf
    • http://kayikciakademi.com/best_whole_house_water_softener_consumer_reportswtnk3.pdf
    • https://vanizubifimid.weebly.com/uploads/1/3/0/8/130874516/xulixiruwazafa-rimopezixoza-pukod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_8faa18656c3c4c14be8e36f20e325f13.pdf?index=true
    • http://forolulazo.rf.gd/chilton_s_auto_manuals.pdf
    • http://silabigajevova.epizy.com/rofikixom.pdf
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_816121661abf4bb49434b535e7930fe7.pdf?index=true
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_27c737f506944bb681683e7bdfaa4ffa.pdf?index=true
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_49a1f74b5a3a4665acf50b31c805b79b.pdf?index=true
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_179c5976790546ac898d2db729d0870e.pdf?index=true
    • http://teboseru.rf.gd/38474167350.pdf
    • https://ad177677-9664-42cd-9bf2-17a10eef6e1d.filesusr.com/ugd/f8915e_8e2274d1b0a744b98ce0b9d3b40a7530.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d3.bin
d103356e095f42c83ec2a181aac6df1d1e5dc52ee23fa7657eb47c8624a79bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 5668 bytes
font_01_sfnt_off000103ef.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 1800 bytes
font_02_sfnt_off00010c7d.bin
222ed95c2d443c46e6f67d81cc84ffe3db03fa43063126f53b6a79da2f5ddd7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 12288 bytes

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