Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2f9b40c7a813fb…

MALICIOUS

PDF

76.3 KB Created: 2021-03-25 09:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d906e48de6ae2cd567c9a95a4cab45c2 SHA-1: 292efea5dc51a8c303420f4c52bbd2adb7c16ae9 SHA-256: 0a2f9b40c7a813fbff1e26c98ed1c1b036c4c2a3f5b92d41fc37fd7a6b407069
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the ML classifier output strongly indicate malicious intent, likely to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=trimble+tsc2+battery+replacement PDF link annotation
    • http://rarubife.mygamesonline.org/is_tokyo_ghoul_season_3_coming_out.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481423/normal_6027edd2d556d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490380/normal_6002e4eede9f1.pdfIn PDF document text
    • http://verification-help.com/intermediate_botany_practical_manualuj5wc.pdfIn PDF document text
    • http://dakekunagefasak.sportsontheweb.net/que_es_enlace_quimico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_6046d71561a75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425005/normal_60076db2a7fa9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391000/normal_5fc7c6ee9ff59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481273/normal_6024bc84ba9c1.pdfIn PDF document text
    • http://superheatbelt.xyz/mechanical_properties_of_materialsvkp5h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5ff471de5953e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390374/normal_5fcbc252d11ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482018/normal_6028e218c3b02.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/timituvupame/what_is_prepositional_phrase_and_their_examples.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_00308d37b44c43fd9a9626061a205d0b.pdf?index=trueIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_cf186376592b4b73bfe352a02bf7b36b.pdf?index=trueIn PDF document text
    • http://vovakupalujum.onlinewebshop.net/oxford_english_basic_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/sequences_and_series_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/admission_form_of_sainik_school_sujanpur_tira.pdfIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_54bfb745c31046708ba85c38d1f430ba.pdf?index=trueIn PDF document text
    • http://domuromu.atwebpages.com/beauty_and_the_beast_piano_duet.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_ec7378e2b28149bcb4e6614ae2855a1a.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_3dbe5565a9fb4e919a04ad48320b5083.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/amazon_fire_tv_screensaver_photos.pdfIn PDF document text
    • http://boxijekew.atwebpages.com/78976173390.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/vezedemewowixafa.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_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 5404 bytes
SHA-256: 017dc11c7072e43f2150e601da58a72f4fe284dc8350c627083533c96a1b878f
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 10580 bytes
SHA-256: 5e7fbbe97364ef884d58b2e32dc7a41e569bd104da8c64dd4edaf9485ced7b3d