Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b67a64f5a05d80b…

MALICIOUS

PDF

116.4 KB Created: 2021-05-15 22:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 02b87a7f162fa4634ebf523702cea335 SHA-1: b5db9344dcaf308487b4b734f19b5dfb9aa35243 SHA-256: 0b67a64f5a05d80b2e7ab76b8c37d6c6c95f497d718e6df260eaf88a00c1283e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the sheer volume of outbound links indicates a high likelihood of directing users to malicious or untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://static.s123-cdn-static.com/uploads/4490141/normal_5fc8da6560ec3.pdf In PDF document text
    • http://gaxesujite.medianewsonline.com/shatter_me.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxaletadi/jekFigR/zubekuzukarizor.pdfIn PDF document text
    • https://cdn.sqhk.co/wukopojenava/Qxoji5M/mississippi_state_parks_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452863/normal_602eb6411c8ad.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/IjfLDja/recette_sandwich_aux_oeufs_buffet.pdfIn PDF document text
    • https://bisubobotikimix.weebly.com/uploads/1/3/1/4/131438323/500642.pdfIn PDF document text
    • https://suzazenesegi.weebly.com/uploads/1/3/0/7/130776168/xobova_giboxejetesejuv_lunodo.pdfIn PDF document text
    • https://cdn.sqhk.co/remimuroku/cibJheQ/bovusifujujatux.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/blowflies_diptera_calliphoridae_of_fennoscandia_and_denmark.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409118/normal_6036ce0c99729.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxujagemo/NjiDhcm/76425688387.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409819/normal_5fe4484f16698.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/2c05ee7827.pdfIn PDF document text
    • http://tujubafi.getenjoyment.net/seweromunirerigepiri.pdfIn PDF document text
    • https://jasesagovog.weebly.com/uploads/1/3/4/6/134619134/morojebozunov_zozogukutej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/KjdSuPfhPRY/wb?keyword=king%20lear%20summary%20videoPDF link annotation
    • https://uploads.strikinglycdn.com/files/8b319616-3894-49ed-9913-a090a2015c54/technical_drawing_with_engineering_graphics_15th_edition_ebook.pdfIn PDF document text
    • http://nijarigu.onlinewebshop.net/86033313331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ee6aaf-a29b-4bb9-8a8e-2d0e239366c7/popular_ballads_2020.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_off00018d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D3C 5276 bytes
SHA-256: 538a5f889adc3bb657983585c0be1dd2cf6d42bee3f5c957f8a7ca360f523f6a
font_01_sfnt_off00019f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F2A 11188 bytes
SHA-256: d70553b019e5e5c94f5e54f9ec0c55d95222795831ee2e04777023fc8da0ef37