Malicious PDF — malware analysis report

Static analysis result for SHA-256 05215c758266710d…

MALICIOUS

PDF

85.6 KB Created: 2021-03-28 21:39:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 91af06197717c81f2d368e431824d896 SHA-1: ee87008cc185b17937d42bf7d808ed840dd29e53 SHA-256: 05215c758266710dea9a549aa7c0bdcab312321a34e5e378e24991377378b02e
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to obscure malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the use of a link farm on disposable hosting. The primary IOC is the URL used in the PDF's metadata and heuristics, which likely leads to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/award?keyword=cea+form+2020+19+pdf+download PDF link annotation
    • http://redatimiwanal.iblogger.org/baxipenumujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459929/normal_601ae96cedbbe.pdfIn PDF document text
    • http://madokedaxemosu.22web.org/best_workout_songs_2018_rap.pdfIn PDF document text
    • http://cmb-accueil.com/cisco_e1200_firmware53dud.pdfIn PDF document text
    • http://reduslim-italiaofficial.site/couple_ballet_dancersck83r.pdfIn PDF document text
    • http://normal-id.com/zuwenomipcq64y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_604d1ba5332e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_600ff3f6b7c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481052/normal_60196a7c74736.pdfIn PDF document text
    • http://sitajejo.22web.org/plague_inc_hack_apk_espaol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_601120e63fb61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bewaxupu.rf.gd/principles_of_cost_accounting_16th_edition.pdfIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_afdefe798b0c4078b2feb818710594d6.pdf?index=trueIn PDF document text
    • http://sifuzetijo.rf.gd/99882227075.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_a8b290ed85074cb0aebde92b86d35b5e.pdf?index=trueIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_69a353c3e2644b82845de57e3aaab554.pdf?index=trueIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_30ba1eaf6cd843ab943a8b81849c0864.pdf?index=trueIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_a2845352124640768726bc5ab3cf3535.pdf?index=trueIn PDF document text
    • http://sapifux.epizy.com/25937466120.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_0c0301abb77b406cacc97887e4661590.pdf?index=trueIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_85404107784f4c999d5ab81acd46fe62.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_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 5488 bytes
SHA-256: 45980c0b2bb78f2bebeb2c4c6c9455ed259f04e116549e5c72e36618eaf10cd4
font_01_sfnt_off00012335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 11056 bytes
SHA-256: bca0cf278624be35d068be95a1e6b90c639f009e97f4f9b7165ea67a43c758fb

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