Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9578dd149caad66…

MALICIOUS

PDF

78.0 KB Created: 2021-03-31 19:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9bb9605e6d7130fdfac9ba05aa39e9cb SHA-1: 25fadd95617e17d7584f75f8ad9cd7eb16b11f06 SHA-256: e9578dd149caad66f72357d60391bf98bd2b18e7a54ea053a4e0451ffd537471
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a prominent one pointing to a link farm on disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the PDF is designed to redirect users to external sites, likely for phishing or scam purposes. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ponafet.ru/wix?keyword=baby+love+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470552/normal_60588747b8e0f.pdfIn PDF document text
    • http://gugaroro.iblogger.org/nogogezefulenajopunopawu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421038/normal_600362bb5bdca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_60159be532a79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5fcde23090b7e.pdfIn PDF document text
    • http://jipolavex.medianewsonline.com/what_not_to_eat_to_get_in_shape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_6012371a83d90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_602c36d94f4be.pdfIn PDF document text
    • http://nitafibejuze.mygamesonline.org/characteristics_of_personality_disorders.pdfIn PDF document text
    • http://subejewumo.scienceontheweb.net/rugemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_603942b1ef4c8.pdfIn PDF document text
    • http://risumeboze.getenjoyment.net/13942289286.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498330/normal_600900453ec83.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/carol_of_the_bells_violin_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448735/normal_603440f9b1bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476010/normal_604ee285f1b4f.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/7676475816.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wetukanezin.atwebpages.com/zujikem.pdfIn PDF document text
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_1ab2743910254d0589ba806863956e10.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_9b56e015503d4f01a53437c69cf337c5.pdf?index=trueIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_bd12fda9d3d24d5cb37c143aaa24f88f.pdf?index=trueIn PDF document text
    • http://jupuzagap.rf.gd/cbse_2018_physics_question_paper_answer_key.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_af8a928cf7a447a78ad2cb5d28ec0ab6.pdf?index=trueIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_28075d97d0a04a44ae025ab121eb317a.pdf?index=trueIn PDF document text
    • http://sufatugajakoras.rf.gd/funokufaxabamud.pdfIn PDF document text
    • http://lewinozed.atwebpages.com/white_fang_movie_2018_wikipedia.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_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 5112 bytes
SHA-256: 3e1e9ebdae201cbe801c5a0c41d1aaca97d12a41a570728aebd4dbbab17f774c
font_01_sfnt_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 13932 bytes
SHA-256: 4c7b552db7f0d04cd0c0f661f5be4aeeaa38fc40363a053ab59f6c0e07980f78

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