Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c9fedd164bfeff…

MALICIOUS

PDF

83.5 KB Created: 2021-03-25 09:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bd205bde73b7467aec081d3809c24700 SHA-1: 5119f5ba4962d831aa5df252c6718a7cb5f6476d SHA-256: 77c9fedd164bfeff517bd20c1c83fa92ef86f8e22479ff2629a3c703be2fc35e
194 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/123?utm_term=cds+exam+form+link PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495696/normal_5fcb1e9d340c2.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/mowosugaki-bobipimafadopu.pdfIn PDF document text
    • https://buminezavo.weebly.com/uploads/1/3/4/6/134650892/gewirel-pimigi-toperinoreno.pdfIn PDF document text
    • https://furimulu.weebly.com/uploads/1/3/1/4/131411024/bovod.pdfIn PDF document text
    • https://mozepuboxiwagu.weebly.com/uploads/1/3/6/0/136094106/lajosinobafa.pdfIn PDF document text
    • https://xoruvuxana.weebly.com/uploads/1/3/2/6/132696063/litasegovoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473039/normal_5fd7f0fdd350f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_60403e460954b.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/definition_of_forensic_accounting.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/37033738407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_34253f9cce284a65abf51c92d599a456.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_46df2347850943dc9d624dd7e32e310a.pdf?index=trueIn PDF document text
    • http://xepatodop.onlinewebshop.net/76916920286.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_ad7f5b937582432a8a5d0b47965054cf.pdf?index=trueIn PDF document text
    • https://3e206333-d6ff-4be5-a246-6289f7259d3b.filesusr.com/ugd/973a7d_de5c342b213c4cd3bdd96fa85facd10e.pdf?index=trueIn PDF document text
    • https://b416d2a3-330e-4518-8f5e-c931256b4cd1.filesusr.com/ugd/5168b2_cc90942e64aa48dba11932d575b96f28.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_0e69723f2559471387ab7324fb8c35bd.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_101fd6889c134acdba9ab7f9f5d8676f.pdf?index=trueIn PDF document text
    • http://situwosase.myartsonline.com/64108265507.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_f55cdd2dec8940949a42fe954a137116.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_de189129cb714c34855c62da948cd20e.pdf?index=trueIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_c3233d2f9e6e43fda1674e0578d3276e.pdf?index=trueIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_be456fa6e2ad4de793da2cdaac185627.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_c530cf198510481f8776054951cd97f3.pdf?index=trueIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_e0df51b7e4204603912031eb0c7b8376.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_c9be9ff10c1a4c5d9e2c2c4a6ac076de.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 4916 bytes
SHA-256: d2ae70e57563ac6a5bffd13d909b7f29e075c69cb03f55c3df101454c1dbfff2
font_01_sfnt_off00010ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 10480 bytes
SHA-256: a10d93a0c47b49a5476161814d3d54c74f7a95d7640dd5c8bcf2e5e1dc449a24
font_02_sfnt_off000132a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361