Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c87b5e8663cb60…

MALICIOUS

PDF

73.7 KB Created: 2021-06-06 15:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0d0d265631152885d7eebd2aca939be6 SHA-1: 52315db8582da9395ef657ed2fc1ef09f408f5d9 SHA-256: 98c87b5e8663cb600f985fabea0eb99ea905463aafaf28aa950284e55ec11eab
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a site related to unemployment benefits, suggesting a phishing lure. ClamAV detected the file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URIs and a link farm heuristic further supports a malicious intent, likely to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://infrive.ru/pbw?utm_term=how+to+claim+weekly+unemployment+benefits+oregon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413122/normal_604b757bc39a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_60466638e5224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_60bcab0e33f6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375339/normal_6001f3deadae1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4485152/normal_60b643d753758.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5ffc893b8ca90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415519/normal_6000257845b14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kimotamiju.pbworks.com/w/file/fetch/144512664/how_to_create_a_branch_in_github_repo.pdfIn PDF document text
    • http://xumefosux.pbworks.com/w/file/fetch/144578403/rowefukazigexujamirenal.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/w/file/fetch/144638232/kelekabijoxonolu.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144624705/tovavivo.pdfIn PDF document text
    • http://xifatarege.pbworks.com/f/stihl_fs_90_engine_rebuild_kit.pdfIn PDF document text
    • http://gapufipi.pbworks.com/f/present_progressive_irregular_forms_3b_4_answers.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144414993/44500456403.pdfIn PDF document text
    • http://kedefoviraj.pbworks.com/w/file/fetch/144652218/norokibekodivinebofitole.pdfIn PDF document text
    • http://faxamom.pbworks.com/f/43337735376.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/f/pitonax.pdfIn PDF document text
    • http://joxupakager.pbworks.com/f/80120503161.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144501141/jobs_in_gta_rp.pdfIn PDF document text
    • http://gupiguna.pbworks.com/f/realidades_2_capitulo_7a-7_answers.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_off0000e037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE037 5692 bytes
SHA-256: 4c1ca220aacd291bf2895a80c95f00dead6d40e4478008d207427525b4f9253a
font_01_sfnt_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 10844 bytes
SHA-256: 966d8e9e9f53fc2be6b5d81384c2d5474edd16e05a67ec475564cdbe6f01c779

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