Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e3aaa4b2e1b796…

MALICIOUS

PDF

76.4 KB Created: 2021-03-24 17:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1639e4ed631ad54c50e5b8d83f6a5bf5 SHA-1: 5426a36e414b146e70264091e802824218ebcad1 SHA-256: 61e3aaa4b2e1b79603d2be961fc13469a6731c8a145b2318d6e239d125187f24
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://druttle.ru/aws?utm_term=city+mini+gt+stroller+weight+capacity PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485457/normal_6012821c2c890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427514/normal_6000ca7e5a114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403129/normal_5fe5a996226d7.pdfIn PDF document text
    • http://nout-sale.site/bil_bot_bluetooth_robotgr1rh.pdfIn PDF document text
    • https://sefujokugitexas.weebly.com/uploads/1/3/1/4/131408298/tulixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371543/normal_5ffe0b18703f1.pdfIn PDF document text
    • http://momentikshop.space/antistress_relaxing_games5gc7m.pdfIn PDF document text
    • https://nuvusutapisi.weebly.com/uploads/1/3/4/4/134460305/juvukib_wukunij.pdfIn PDF document text
    • http://topshops.website/weekly_math_homework_answers_6th_gradeseb6t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_604b8d968a873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_600a28fb3852a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479904/normal_5fd167258c34c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485813/normal_5fdc0082a0662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5fe2f93aaa5d9.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/dd054cc8-591a-4d4a-8243-5b616cb56cee/dir-655_wifi_password_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d6f57ae-e7e3-43a8-b570-5094af4df919/mary_poppins_5_book_collection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec55bd8d-20c7-4a15-86a8-8e9dca5186ed/38393243532.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_10462f6152a24bd1872874c1b90f1fc0.pdf?index=trueIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_81859b93db574f1e8d8d197ec0e59ce8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a738867-ac5f-4fe9-a91d-17b1a136f20b/samsung_range_display_problems.pdfIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_c9f9605486354fa5b0a10dd4c8d6fd05.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 5448 bytes
SHA-256: 0b2ec7628e5d536abef5d6035c429838322e8ad985972a29f636405d270b109c
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 12076 bytes
SHA-256: ac2d9635740618c315aafb28b78caf38e65cbed28f621eefcf6b53cb11f55574

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