Malicious PDF — malware analysis report

Static analysis result for SHA-256 94bc9d4e3712196b…

MALICIOUS

PDF

76.4 KB Created: 2021-05-12 07:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f6ae7be143500eeae0f0f730ddad9d58 SHA-1: d9de2afbd842114242e9e71c1c0b513a9c39a55b SHA-256: 94bc9d4e3712196b77bc90d1e29c83be42bfde20e48a2a9441667470387eaf93
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://pelibifir.ru/strik?utm_term=warhammer+40k+ork+codex+8th+edition+pdf PDF link annotation
    • https://gasomuvujutomeb.weebly.com/uploads/1/3/4/3/134356107/7171efba1.pdfIn PDF document text
    • http://trackcreditscore.info/54775338479yu69q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495251/normal_605c224444bf8.pdfIn PDF document text
    • http://bnl-jobs.com/49296867434khwfk.pdfIn PDF document text
    • https://xexofomes.weebly.com/uploads/1/3/4/4/134489610/5fcd85614f1a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385417/normal_5fe4b97d6afd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393515/normal_606812f24f240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503525/normal_5ffb8334e47ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_6064ecde7b6b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489237/normal_5ff0e0dba938d.pdfIn PDF document text
    • http://copyrightnotices-form.com/the_tower_of_nero_the_trials_of_apollo_book_5_summaryuc3ri.pdfIn PDF document text
    • http://5gusevshop.space/felebozugenubuwovibus08apf.pdfIn PDF document text
    • http://tesocoin.online/merchant_of_venice_ebook_download6sp5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496151/normal_5fc69005282e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_604d7c89d1a32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_603c015883bef.pdfIn PDF document text
    • http://sobuvide.mygamesonline.org/pseudomonas_spp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ce20e5-6147-4a28-be91-69dcd313774a/26105986604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02bb8689-3e90-4f85-9cef-001c6a71de45/koxele.pdfIn PDF document text
    • http://rorokepu.atwebpages.com/jaketijavamixaniju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9cf5917-de6f-4bf3-bd63-e7844dcbdec6/letra_de_cancion_catolica_jesus_amigo.pdfIn PDF document text
    • http://powagamojij.onlinewebshop.net/jezovezoledimezaje.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_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 5752 bytes
SHA-256: 526ab94e58a6748cd23cbb75875aec076a18a96c977892888625a069007e656b
font_01_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 9976 bytes
SHA-256: 26ff8c83dcce0ccf9655c6c1fc94356b72f252fcce778794c9d2162ceb8df665

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