Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9468fd48371243e…

MALICIOUS

PDF

193.6 KB Created: 2020-12-16 14:45:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: de60f48c6cbfc4676e2b5b1a623cff2c SHA-1: 91f5e8ad1bd43a1d4cbd7461f53f8d80738332a5 SHA-256: e9468fd48371243e9a41f16d0f447c7cd7d52f0923974bd0ec373860180a4acf
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs that redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/123?utm_term=candle+of+the+deep+5e+cost PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450347/normal_5faf02dcc2ba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446937/normal_5fad7c6fb30d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5fa7734351c7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446649/normal_5fbe5a530ebcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5fa6fc7c34363.pdfIn PDF document text
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/e90412.pdfIn PDF document text
    • https://wenajatimox.weebly.com/uploads/1/3/4/4/134480159/noladuki.pdfIn PDF document text
    • https://ninukiwipovesot.weebly.com/uploads/1/3/0/9/130969879/bdbc33bd.pdfIn PDF document text
    • https://bumokodujexub.weebly.com/uploads/1/3/4/5/134595190/7415686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_5f9e4214d2330.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1983ee2fce462bc90e0df/t/5fcadc586e74d26c6ff3341d/1607130200784/vonugewirigudizakonide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ddb266-d00f-4a07-8eec-75926ef50123/40670511495.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/java_swing_display.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28a8460f2895dc1f24b3d/t/5fc8f59e2197e711ef7ef5f1/1607005600973/5307163110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42802ea6-29bd-4cc8-a326-5958abd89ff9/towipudupibumuw.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/molisivefekuwenupotedam.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_off0002bf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BF91 5176 bytes
SHA-256: 1184664d390472dde2659f1a921376588c820b0b667d32a1df5599a7f7c089de
font_01_sfnt_off0002d132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D132 11524 bytes
SHA-256: 844dd9b6f8189edf7d389f1136e5c2556639105dff217c0f58f49bb43c9d675f

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