Malicious PDF — malware analysis report

Static analysis result for SHA-256 615a5434a4bb4af4…

MALICIOUS

PDF

75.4 KB Created: 2021-03-30 06:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0560650d5f25b3092d05764356ba2ed8 SHA-1: cee0e91d2daa3840190df50037bcd741a7d4a8c7 SHA-256: 615a5434a4bb4af470b238a22583c43f57bc4bd41706f38bf2ee3fdca5f0239c
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by numerous embedded URLs pointing to disposable hosting and link farms. The PDF structure and embedded URIs suggest an attempt to redirect users to external malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the overall pattern is consistent with a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/wix?keyword=unt+policy+manual PDF link annotation
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/c2c1831df7953.pdfIn PDF document text
    • http://nawitebexu.medianewsonline.com/agricultura_itinerante.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/how_to_understand_candlestick_charts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366366/normal_5ffddb33a2032.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/napat_takivozifam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375204/normal_6002549dd5305.pdfIn PDF document text
    • http://esmoney.site/xelarikosx7s6k.pdfIn PDF document text
    • http://procripton.com/via_degli_dei_cartinadjh2s.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/mental_status_exam_child_template.pdfIn PDF document text
    • http://wegansit.space/vedozixijutilexajoc8e2w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501037/normal_5fd24deddf9c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387712/normal_600669ac412eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415745/normal_5fee93315d2dd.pdfIn PDF document text
    • https://guvatezip.weebly.com/uploads/1/3/0/7/130776756/xefisafake.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/xekuli.pdfIn PDF document text
    • http://niwadeg.mywebcommunity.org/composicion_de_la_placa_bacteriana.pdfIn PDF document text
    • https://zitakutuseg.weebly.com/uploads/1/3/5/9/135994262/f38f532e45.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/759b69ec-7c66-485d-81dd-2cd3d22a89ad/how_to_manage_your_time_as_a_teenager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db981b88-08f1-43bc-85ef-83f126163a8d/minn_kota_talon_12_ft_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67bf219d-d5df-42ec-ab0e-06818cc28f0d/39039822743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54bd531-03eb-44c9-a05e-db97a97fa5fd/jerifon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53a4704-7e96-49cf-ad3a-fda1077cf8f6/wuteveworakafobibaguwopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ed14b7-773a-4958-a837-1fcadbe99d79/98066383882.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_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 4900 bytes
SHA-256: f9a6c0a2aedbcf3257fff2539e6ecbd1923d80ae3a7a6c0a059dc852f7aef915
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 10388 bytes
SHA-256: 49974638fd0dfc0cd33e9b7abd91bdaaa2d40ab48751366333ab1999cec84a25

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