Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf52b65a0d79e70…

MALICIOUS

PDF

77.9 KB Created: 2021-04-18 15:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 223a0322f42dc8e67dcf8c0d828b0132 SHA-1: 5126f186f644e3a52126985f0222f41fb3f0501a SHA-256: 8cf52b65a0d79e705c889ad9fd4e4d9f91904b49349787ca31dce828ddde2e32
66 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to disposable domains and are likely used for phishing or to redirect to malicious content. The ML classifier strongly indicated maliciousness, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the suspicious nature of the embedded links. No scripts were extracted, but the primary attack vector appears to be the extensive use of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://vilenefex.ru/strik?utm_term=magpul+magwell+glock+19+gen+3+review PDF link annotation
    • http://xulazawelinuze.scienceontheweb.net/72542900981.pdfIn PDF document text
    • http://giveaway2020.info/docker_alpine_apk_permission_denied2sgo1.pdfIn PDF document text
    • http://businesslinecenter.com/dungeons_3_creature_guide6eb3u.pdfIn PDF document text
    • https://cdn.sqhk.co/lusesito/hcGwifG/mineral_spirits_lowes.pdfIn PDF document text
    • https://cdn.sqhk.co/xafazunusa/whbgfhh/biochemistry_carbohydrates_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488604/normal_5fdf906e3c96a.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/english_grammar_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/dhfji4g/42458649429.pdfIn PDF document text
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/xudagujunoseretobojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496586/normal_600dfdbbe9853.pdfIn PDF document text
    • https://valisuzikejuxeg.weebly.com/uploads/1/3/4/0/134017117/4157049.pdfIn PDF document text
    • http://eu-study.ru/mcconnell_brue_flynn_macroeconomicsnxud4.pdfIn PDF document text
    • http://vilopeg.xyz/2014_honda_civic_service_resetxbt2c.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/YhpaihK/stick_shadow_war_fight.pdfIn PDF document text
    • https://butadopol.weebly.com/uploads/1/3/1/3/131378795/xiwizug-padugemuva-zuson-kizisufugaduses.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/agiiijd/switzerland_age_pyramid.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/tokafanawa/87739889054.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/wekumavowavabed.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/16741087366.pdfIn PDF document text
    • http://nuvebabe.atwebpages.com/85101178114.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/felekerawewax.pdfIn PDF document text
    • http://gagolabirej.atwebpages.com/plc_programming_sri_lanka.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/quick_reference_guide_template.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_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 5668 bytes
SHA-256: 286122789d6a5151091e1fc8862c96c3e5e72e6829c0dca08f022c9e7d46dc14
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 12752 bytes
SHA-256: ee1d45ec9ab4ad90357d1941774f60e414fa4011504d4363c58f76eda44e3b58

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