Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ecdfbee9ce711e…

MALICIOUS

PDF

67.4 KB Created: 2021-05-29 19:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e1c9c2d40c0277ba00091b0aa42796d9 SHA-1: a8ca4d412628dd53226b7c23e979faea679cc860 SHA-256: f8ecdfbee9ce711ede99d2e19f9b8f259307b34dc5f348d591a82f2e77f9adb2
134 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 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 0.9998

Heuristics 6

  • 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://kuzutuzo.ru/strik?utm_term=ascending+and+descending+order+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446921/normal_5fe6e30d04866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420915/normal_5ffbc99e8cd44.pdfIn PDF document text
    • https://gimimelaxagoke.weebly.com/uploads/1/3/2/7/132740951/vuruwuvirowix_kapidexekefibur_suwefekamen_jedisotizixesi.pdfIn PDF document text
    • https://zatitobeme.weebly.com/uploads/1/3/4/0/134097178/bigax-kadazazutovik-ragexipideru-diromezaverijol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_5fdc149c976bc.pdfIn PDF document text
    • https://posenumu.weebly.com/uploads/1/3/0/7/130776111/timosinenegozulep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408172/normal_6015b69fed435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_606237ff15e77.pdfIn PDF document text
    • https://nugekowu.weebly.com/uploads/1/3/4/5/134587082/5972901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_6031af66721a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413225/normal_5ff307f28fe40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_60498c01cb974.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/vivoturiwalifef_zafapizopi_mupekefis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_6043f2abce8fa.pdfIn PDF document text
    • https://tofeniva.weebly.com/uploads/1/3/4/6/134625175/79525df6e91b65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410714/normal_5ff2e0a65d77a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454668/normal_5fce0bf9c38d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492871/normal_5fee1c7050e8e.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/e76288ae-d960-4ffb-ae66-4cc430d375cb/what_is_a_pun_in_romeo_and_juliet_act_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf23a16a-d5a3-4a44-b4e6-e41567ef222f/32514533327.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_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 5312 bytes
SHA-256: 251b84b60a997322e5174659c733bc84559ed35254b77711300fbde2ce067606
font_01_sfnt_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 10004 bytes
SHA-256: ce81486160e0d937e4a4214f767336e6a603fc5654896eb932a315f09bfa6f6f

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