Malicious PDF — malware analysis report

Static analysis result for SHA-256 485f8571f0fdefcb…

MALICIOUS

PDF

89.1 KB Created: 2021-04-20 23:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ad67ee71f02f2ffbf342310f02249944 SHA-1: 866eb707628e8d954f6d2ec571073c85f03a5b33 SHA-256: 485f8571f0fdefcb6a35bb8ce7421a88566d2924c10273277ca561faa37b8d2e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful sites, possibly leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/strik?utm_term=frases+celebres+del+libro+cien+a%25C3%25B1os+de+soledad PDF link annotation
    • http://1green.space/frosty_the_snowman_song_lyrics1fbm4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385847/normal_5ff26d00958b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_603378876deb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_604b3d75be6ad.pdfIn PDF document text
    • http://soldonlakewood.com/how_much_is_a_used_nintendo_ds_worthazvln.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daniwodug/app_connect_vw_android_auto.pdfIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_47d4d4b6eb2d468f8ad9dad8004fd63f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b20bbf-2b09-4449-9731-64ce2a1309fe/winodog.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/16926853988.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_c16909cdd6be4094b1e5764ef6a735bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2c2b9d-8d87-4269-886b-4c1dd7f11206/what_does_new_testament_say_about_marriage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b92686-328e-48ce-9bb3-a6488dac886e/3512808501.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/piwawikerovajobabofanefi.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/cursos_de_ingles_gratis_en_linea_unam.pdfIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_aad6b93e30dc443d8c7326713aed0d70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b1463ef-a2e0-44ad-97e2-ce689a6d2a2d/91069024262.pdfIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_e05a406c3da94003a9abb51b69adc392.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a4dc0d-8af8-4a05-bc75-5dc75816edde/ralepejunosogebin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a3b7ed-324b-4e81-b7d1-164b4f45a39c/tikomezunekazajoremojina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf175b52-0274-4364-ae8a-0e0a4e58ed79/rokosafalajesapi.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/michelin_guide_argentina_restaurants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6333bb9c-beb8-4ba6-a838-28e61d892b17/xuwolunezumizodigofevud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b15e70cb-3c6a-456b-be19-ced356b4487b/31636546777.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_619c02e33d91471db19f2145a373af4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5212218e-cf9b-4997-a80a-a3fa041f38eb/6700957970.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 5240 bytes
SHA-256: a39d0c163eae999acda3fa0e469ee32ed13111cf3facbb4b8e3d3c243d04d144
font_01_sfnt_off00012d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4E 11912 bytes
SHA-256: efbcedb5b5ddf14650844711bee1b858691b204e4ea149cdb918f73281b94dcc